🕷️ Crawler Inspector

URL Lookup

Direct Parameter Lookup

Raw Queries and Responses

1. Shard Calculation

Query:

Response:

Calculated Shard: 169 (from laksa194)

2. Crawled Status Check

Query:

curl -X POST \
  'http://laksa169.int.ahrefs:8124/' \
  -H 'Content-Type: text/plain' \
  -H 'X-ClickHouse-Database: crawler3' \
  -H 'Authorization: Basic YXBpOg==' \
  -d 'SELECT getAhrefsURLFromUnparsed(src_unparsed) AS found_url, ifNull(toUnixTimestamp(download_stamp), 0) AS crawl_time, ifNull(toUnixTimestamp(props_url_first_seen), 0) AS first_indexed_time, download_http_code AS http_code, src_unparsed AS src_unparsed, src_root_hash AS src_root_hash, history_drop_reason AS history_drop_reason, meta_title AS meta_title, meta_descriptions AS meta_descriptions, attrs_boilerpipe_text AS attrs_boilerpipe_text, attrs_markdown AS attrs_markdown, attrs_readable_markdown AS attrs_readable_markdown, meta_canonical AS meta_canonical FROM crawler3.page_info_local FINAL PREWHERE (src_root_hash, src_unparsed) IN ((getAhrefsRootHashFromUnparsed(getAhrefsUnparsedNoserviceFromURL(\'https://stackoverflow.com/questions/37147735/remove-nan-value-from-a-set\')), getAhrefsUnparsedNoserviceFromURL(\'https://stackoverflow.com/questions/37147735/remove-nan-value-from-a-set\'))) FORMAT JSONEachRow'

Response:

{"found_url":"https:\/\/stackoverflow.com\/questions\/37147735\/remove-nan-value-from-a-set","crawl_time":1768537513,"first_indexed_time":0,"http_code":200,"src_unparsed":"com,stackoverflow!\/questions\/37147735\/remove-nan-value-from-a-set s443","src_root_hash":"714406497480128969","history_drop_reason":null,"meta_title":"python - Remove NaN value from a set - Stack Overflow","meta_descriptions":[],"attrs_boilerpipe_text":"This question shows research effort; it is useful and clear\n26\nSave this question.\nShow activity on this post.\nIs it possible to easily remove NaN values for a Python Set object?  Given that NaN values do not equal anything (and\nfloat('nan') is float('nan')\nis also\nFalse\n), you can end up with many NaN values in a Set.\n>>>\na =\nset\n( (\nfloat\n(\n'nan'\n),\nfloat\n(\n'nan'\n),\n'a'\n) )\n>>>\na\n{nan, nan,\n'a'\n}\nThe best I can come up with it to define a function like math.isnan, but that is tolerant of non-float types like:\ndef\nmy_isnan\n(\nx\n):\ntry\n:\nreturn\nmath.isnan(x)\nexcept\nTypeError:\nreturn\nFalse\nThen you can use a set comprehension like this:\n>>>\n{x\nfor\nx\nin\na\nif\nnot\nmy_isnan(x)}\n{\n'a'\n}\nasked\nMay 10, 2016 at 19:52\n6\nThis answer is useful\n21\nSave this answer.\nShow activity on this post.\nIn practice, you could look at the fact that\nnan != nan\nas a feature, not a bug:\n>>>\na = {\nfloat\n(\n'nan'\n),\nfloat\n(\n'nan'\n),\n'a'\n}\n>>>\na\n{nan, nan,\n'a'\n}\n>>>\n{x\nfor\nx\nin\na\nif\nx==x}\n{\n'a'\n}\nOn the positive side, no need for a helper function.  On the negative side, if you have a non-nan object which is also not equal to itself, you'll remove that too.\nanswered\nMay 10, 2016 at 20:36\n1 Comment\nI knew there had to be some way with resorting to the helper function.  Thanks!\n2016-05-10T20:43:04.593Z+00:00\nThis answer is useful\n8\nSave this answer.\nShow activity on this post.\nUse\npd.notna()\nfrom pandas, e.g.:\nIn [\n219\n]:\nimport\npandas\nas\npd\n\nIn [\n220\n]: a =\nset\n((\nfloat\n(\n'nan'\n),\nfloat\n(\n'nan'\n),\n'a'\n))\n\nIn [\n221\n]: a = {x\nfor\nx\nin\na\nif\npd.notna(x)}\n\nIn [\n222\n]: a\nOut[\n222\n]: {\n'a'\n}\nanswered\nNov 16, 2018 at 23:20\nComments\nThis answer is useful\n4\nSave this answer.\nShow activity on this post.\nAlso you can use\nfilter\n:\nIn[\n75\n]: a =\nset\n((\nfloat\n(\n'nan'\n),\nfloat\n(\n'nan'\n),\n'a'\n))\n\nIn[\n76\n]:\nset\n(\nfilter\n(\nlambda\nx: x == x , a))\nOut[\n76\n]: {\n'a'\n}\nanswered\nMay 10, 2016 at 20:36\nej_f\n460\n3 silver badges\n9 bronze badges\nComments\nThis answer is useful\n3\nSave this answer.\nShow activity on this post.\nWe can simply use the .remove() method\nIn[\n1\n]: a =\nset\n([np.nan,\n\"A\"\n])\nIn[\n2\n]: a\nOut: {\n'A'\n, nan}\nIn[\n3\n]: a.remove(np.nan)\nIn[\n4\n]: a\nOut: {\n'A'\n}\nanswered\nOct 15, 2020 at 21:49\n3 Comments\nPlease consider add some explanation\/comments to the code.\n2020-10-15T22:47:25.62Z+00:00\nAs @Fre_der_ik noted,\nremove()\nwill raise an error if there is no NaN in the set. Use\ndiscard()\ninstead.\n2020-11-26T15:13:12.77Z+00:00\n@Benoît Lebreton Your answer helped me a lot.\n2021-02-13T07:33:12.087Z+00:00\nThis answer is useful\n0\nSave this answer.\nShow activity on this post.\nI cannot make a comment, so I combine the answers above, with some explanation (for beginners).\nCreate a set, including NaN (numpy.nan value)\nIn[\n1\n]:\nimport\nnumpy\nas\nnp\nIn[\n2\n]: a =\nset\n([np.nan,\n'A'\n])\nCheck the created set as result:\nIn[\n3\n]: a\nOut: {\n'A'\n, nan}\nDiscard (better then remove which could lead to KeyError if there is non NaN in the set) NaNs:\nIn[\n4\n]: a.discard(np.nan)\nCheck the result:\nIn[\n5\n]: a\nOut: {\n'A'\n}\nanswered\nAug 2, 2023 at 8:14\nComments\nStart asking to get answers\nFind the answer to your question by asking.\nAsk question\nExplore related questions\nSee similar questions with these tags.","attrs_markdown":"# ![site logo](https:\/\/stackoverflow.com\/Content\/Img\/SE-logo75.png)\nBy clicking “Sign up”, you agree to our [terms of service](https:\/\/stackoverflow.com\/legal\/terms-of-service\/public) and acknowledge you have read our [privacy policy](https:\/\/stackoverflow.com\/legal\/privacy-policy).\n\n# OR\n\nAlready have an account? [Log in](https:\/\/stackoverflow.com\/users\/login)\n\n[Skip to main content](https:\/\/stackoverflow.com\/questions\/37147735\/remove-nan-value-from-a-set#content)\n\n[Stack Overflow](https:\/\/stackoverflow.com\/)\n\n1. [About](https:\/\/stackoverflow.co\/)\n2. Products\n3. [For Teams](https:\/\/stackoverflow.co\/internal\/)\n\n1. [Stack Internal Implement a knowledge platform layer to power your enterprise and AI tools.](https:\/\/stackoverflow.co\/internal\/?utm_medium=referral&utm_source=stackoverflow-community&utm_campaign=top-nav&utm_content=stack-overflow-for-teams)\n2. [Stack Data Licensing Get access to top-class technical expertise with trusted & attributed content.](https:\/\/stackoverflow.co\/data-licensing\/?utm_medium=referral&utm_source=stackoverflow-community&utm_campaign=top-nav&utm_content=overflow-api)\n3. [Stack Ads Connect your brand to the world’s most trusted technologist communities.](https:\/\/stackoverflow.co\/advertising\/?utm_medium=referral&utm_source=stackoverflow-community&utm_campaign=top-nav&utm_content=stack-overflow-advertising)\n4. [Releases Keep up-to-date on features we add to Stack Overflow and Stack Internal.](https:\/\/stackoverflow.blog\/releases\/?utm_medium=referral&utm_source=stackoverflow-community&utm_campaign=top-nav&utm_content=releases)\n5. [About the company](https:\/\/stackoverflow.co\/?utm_medium=referral&utm_source=stackoverflow-community&utm_campaign=top-nav&utm_content=about-the-company) [Visit the blog](https:\/\/stackoverflow.blog\/?utm_medium=referral&utm_source=stackoverflow-community&utm_campaign=top-nav&utm_content=blog)\n\n1. ### [current community](https:\/\/stackoverflow.com\/)\n   - [Stack Overflow](https:\/\/stackoverflow.com\/)\n     [help](https:\/\/stackoverflow.com\/help) [chat](https:\/\/chat.stackoverflow.com\/?tab=explore)\n   - [Meta Stack Overflow](https:\/\/meta.stackoverflow.com\/)\n   ### your communities\n   [Sign up](https:\/\/stackoverflow.com\/users\/signup?ssrc=site_switcher&returnurl=https%3A%2F%2Fstackoverflow.com%2Fquestions%2F37147735%2Fremove-nan-value-from-a-set) or [log in](https:\/\/stackoverflow.com\/users\/login?ssrc=site_switcher&returnurl=https%3A%2F%2Fstackoverflow.com%2Fquestions%2F37147735%2Fremove-nan-value-from-a-set) to customize your list.\n   \n   ### [more stack exchange communities](https:\/\/stackexchange.com\/sites)\n   [company blog](https:\/\/stackoverflow.blog\/)\n2. [Log in](https:\/\/stackoverflow.com\/users\/login?ssrc=head&returnurl=https%3A%2F%2Fstackoverflow.com%2Fquestions%2F37147735%2Fremove-nan-value-from-a-set)\n3. [Sign up](https:\/\/stackoverflow.com\/users\/signup?ssrc=head&returnurl=https%3A%2F%2Fstackoverflow.com%2Fquestions%2F37147735%2Fremove-nan-value-from-a-set)\n\n# Let's set up your homepage Select a few topics you're interested in:\npython\n\njavascript\n\nc\\#\n\nreactjs\n\njava\n\nandroid\n\nhtml\n\nflutter\n\nc++\n\nnode.js\n\ntypescript\n\ncss\n\nr\n\nphp\n\nangular\n\nnext.js\n\nspring-boot\n\nmachine-learning\n\nsql\n\nexcel\n\nios\n\nazure\n\ndocker\n\nOr search from our full list:\n\n- javascript\n- python\n- java\n- c\\#\n- php\n- android\n- html\n- jquery\n- c++\n- css\n- ios\n- sql\n- mysql\n- r\n- reactjs\n- node.js\n- arrays\n- c\n- asp.net\n- json\n- python-3.x\n- .net\n- ruby-on-rails\n- sql-server\n- swift\n- django\n- angular\n- objective-c\n- excel\n- pandas\n- angularjs\n- regex\n- typescript\n- ruby\n- linux\n- ajax\n- iphone\n- vba\n- xml\n- laravel\n- spring\n- asp.net-mvc\n- database\n- wordpress\n- string\n- flutter\n- postgresql\n- mongodb\n- wpf\n- windows\n- xcode\n- amazon-web-services\n- bash\n- git\n- oracle-database\n- spring-boot\n- dataframe\n- azure\n- firebase\n- list\n- multithreading\n- docker\n- vb.net\n- react-native\n- eclipse\n- algorithm\n- powershell\n- macos\n- visual-studio\n- numpy\n- image\n- forms\n- scala\n- function\n- vue.js\n- performance\n- twitter-bootstrap\n- selenium\n- winforms\n- kotlin\n- loops\n- dart\n- express\n- hibernate\n- sqlite\n- matlab\n- python-2.7\n- shell\n- rest\n- apache\n- entity-framework\n- android-studio\n- csv\n- maven\n- linq\n- qt\n- dictionary\n- unit-testing\n- asp.net-core\n- facebook\n- apache-spark\n- tensorflow\n- file\n- swing\n- class\n- unity-game-engine\n- sorting\n- date\n- authentication\n- go\n- symfony\n- t-sql\n- opencv\n- matplotlib\n- .htaccess\n- google-chrome\n- for-loop\n- datetime\n- codeigniter\n- perl\n- http\n- validation\n- sockets\n- google-maps\n- object\n- uitableview\n- xaml\n- oop\n- visual-studio-code\n- if-statement\n- cordova\n- ubuntu\n- web-services\n- email\n- android-layout\n- github\n- spring-mvc\n- elasticsearch\n- kubernetes\n- selenium-webdriver\n- ms-access\n- ggplot2\n- user-interface\n- parsing\n- pointers\n- google-sheets\n- c++11\n- security\n- machine-learning\n- google-apps-script\n- ruby-on-rails-3\n- templates\n- flask\n- nginx\n- variables\n- exception\n- sql-server-2008\n- gradle\n- debugging\n- tkinter\n- delphi\n- listview\n- jpa\n- asynchronous\n- haskell\n- web-scraping\n- pdf\n- jsp\n- ssl\n- amazon-s3\n- google-cloud-platform\n- testing\n- jenkins\n- xamarin\n- wcf\n- batch-file\n- generics\n- npm\n- ionic-framework\n- network-programming\n- unix\n- recursion\n- google-app-engine\n- mongoose\n- visual-studio-2010\n- .net-core\n- android-fragments\n- assembly\n- animation\n- math\n- svg\n- rust\n- session\n- intellij-idea\n- hadoop\n- join\n- curl\n- winapi\n- django-models\n- laravel-5\n- next.js\n- url\n- heroku\n- http-redirect\n- tomcat\n- google-cloud-firestore\n- inheritance\n- webpack\n- gcc\n- image-processing\n- swiftui\n- keras\n- asp.net-mvc-4\n- logging\n- dom\n- matrix\n- pyspark\n- actionscript-3\n- button\n- post\n- optimization\n- firebase-realtime-database\n- jquery-ui\n- cocoa\n- xpath\n- iis\n- web\n- d3.js\n- javafx\n- firefox\n- xslt\n- internet-explorer\n- caching\n- select\n- asp.net-mvc-3\n- opengl\n- events\n- asp.net-web-api\n- plot\n- dplyr\n- encryption\n- magento\n- stored-procedures\n- search\n- amazon-ec2\n- ruby-on-rails-4\n- memory\n- canvas\n- multidimensional-array\n- audio\n- random\n- jsf\n- vector\n- redux\n- cookies\n- input\n- facebook-graph-api\n- flash\n- indexing\n- xamarin.forms\n- arraylist\n- ipad\n- cocoa-touch\n- data-structures\n- video\n- model-view-controller\n- azure-devops\n- serialization\n- apache-kafka\n- jdbc\n- razor\n- woocommerce\n- awk\n- routes\n- mod-rewrite\n- servlets\n- excel-formula\n- beautifulsoup\n- filter\n- iframe\n- docker-compose\n- design-patterns\n- aws-lambda\n- text\n- visual-c++\n- django-rest-framework\n- cakephp\n- mobile\n- android-intent\n- struct\n- react-hooks\n- methods\n- groovy\n- mvvm\n- lambda\n- ssh\n- time\n- checkbox\n- ecmascript-6\n- grails\n- google-chrome-extension\n- installation\n- cmake\n- sharepoint\n- shiny\n- spring-security\n- jakarta-ee\n- plsql\n- android-recyclerview\n- core-data\n- types\n- sed\n- meteor\n- android-activity\n- bootstrap-4\n- activerecord\n- websocket\n- replace\n- graph\n- group-by\n- scikit-learn\n- vim\n- file-upload\n- boost\n- junit\n- memory-management\n- sass\n- async-await\n- import\n- deep-learning\n- error-handling\n- eloquent\n- dynamic\n- dependency-injection\n- soap\n- silverlight\n- layout\n- apache-spark-sql\n- charts\n- deployment\n- browser\n- gridview\n- svn\n- while-loop\n- google-bigquery\n- vuejs2\n- highcharts\n- dll\n- ffmpeg\n- view\n- foreach\n- makefile\n- plugins\n- redis\n- c\\#-4.0\n- reporting-services\n- jupyter-notebook\n- unicode\n- merge\n- reflection\n- https\n- server\n- google-maps-api-3\n- twitter\n- oauth-2.0\n- extjs\n- terminal\n- axios\n- pip\n- split\n- cmd\n- pytorch\n- encoding\n- django-views\n- collections\n- database-design\n- hash\n- netbeans\n- automation\n- ember.js\n- data-binding\n- build\n- tcp\n- pdo\n- sqlalchemy\n- apache-flex\n- entity-framework-core\n- concurrency\n- command-line\n- spring-data-jpa\n- printing\n- react-redux\n- java-8\n- lua\n- html-table\n- neo4j\n- ansible\n- service\n- mysqli\n- jestjs\n- enums\n- parameters\n- flexbox\n- material-ui\n- module\n- promise\n- visual-studio-2012\n- outlook\n- web-applications\n- uwp\n- firebase-authentication\n- webview\n- jquery-mobile\n- utf-8\n- datatable\n- python-requests\n- parallel-processing\n- colors\n- drop-down-menu\n- scipy\n- scroll\n- tfs\n- hive\n- count\n- syntax\n- ms-word\n- twitter-bootstrap-3\n- ssis\n- fonts\n- rxjs\n- constructor\n- google-analytics\n- file-io\n- paypal\n- three.js\n- powerbi\n- graphql\n- cassandra\n- discord\n- graphics\n- compiler-errors\n- gwt\n- react-router\n- socket.io\n- backbone.js\n- solr\n- memory-leaks\n- url-rewriting\n- datatables\n- nlp\n- terraform\n- oauth\n- datagridview\n- drupal\n- zend-framework\n- oracle11g\n- triggers\n- knockout.js\n- neural-network\n- interface\n- django-forms\n- angular-material\n- casting\n- jmeter\n- linked-list\n- google-api\n- path\n- timer\n- arduino\n- django-templates\n- orm\n- proxy\n- directory\n- windows-phone-7\n- parse-platform\n- visual-studio-2015\n- cron\n- conditional-statements\n- push-notification\n- functional-programming\n- primefaces\n- pagination\n- model\n- jar\n- xamarin.android\n- hyperlink\n- uiview\n- vbscript\n- visual-studio-2013\n- google-cloud-functions\n- azure-active-directory\n- gitlab\n- jwt\n- download\n- swift3\n- sql-server-2005\n- process\n- pygame\n- rspec\n- configuration\n- properties\n- combobox\n- callback\n- windows-phone-8\n- linux-kernel\n- safari\n- scrapy\n- permissions\n- emacs\n- x86\n- clojure\n- scripting\n- raspberry-pi\n- io\n- scope\n- azure-functions\n- compilation\n- expo\n- responsive-design\n- mongodb-query\n- nhibernate\n- angularjs-directive\n- reference\n- binding\n- bluetooth\n- request\n- architecture\n- dns\n- playframework\n- pyqt\n- 3d\n- version-control\n- discord.js\n- doctrine-orm\n- package\n- f\\#\n- rubygems\n- get\n- sql-server-2012\n- autocomplete\n- tree\n- openssl\n- datepicker\n- kendo-ui\n- jackson\n- yii\n- controller\n- grep\n- nested\n- xamarin.ios\n- static\n- null\n- transactions\n- statistics\n- datagrid\n- active-directory\n- dockerfile\n- uiviewcontroller\n- webforms\n- sas\n- discord.py\n- computer-vision\n- phpmyadmin\n- notifications\n- duplicates\n- pycharm\n- mocking\n- youtube\n- yaml\n- nullpointerexception\n- menu\n- blazor\n- sum\n- plotly\n- bitmap\n- visual-studio-2008\n- asp.net-mvc-5\n- floating-point\n- css-selectors\n- yii2\n- stl\n- electron\n- android-listview\n- jsf-2\n- time-series\n- cryptography\n- ant\n- hashmap\n- character-encoding\n- stream\n- msbuild\n- asp.net-core-mvc\n- sdk\n- google-drive-api\n- jboss\n- selenium-chromedriver\n- joomla\n- devise\n- navigation\n- cors\n- cuda\n- anaconda\n- frontend\n- background\n- multiprocessing\n- binary\n- pyqt5\n- camera\n- iterator\n- linq-to-sql\n- mariadb\n- onclick\n- android-jetpack-compose\n- ios7\n- microsoft-graph-api\n- android-asynctask\n- rabbitmq\n- tabs\n- amazon-dynamodb\n- laravel-4\n- environment-variables\n- uicollectionview\n- insert\n- linker\n- xsd\n- coldfusion\n- console\n- continuous-integration\n- upload\n- textview\n- ftp\n- opengl-es\n- operating-system\n- macros\n- mockito\n- localization\n- formatting\n- xml-parsing\n- json.net\n- type-conversion\n- vuejs3\n- data.table\n- kivy\n- timestamp\n- integer\n- calendar\n- segmentation-fault\n- android-ndk\n- prolog\n- drag-and-drop\n- char\n- crash\n- jasmine\n- dependencies\n- geometry\n- automated-tests\n- azure-pipelines\n- fortran\n- android-gradle-plugin\n- itext\n- sprite-kit\n- mfc\n- header\n- attributes\n- nosql\n- firebase-cloud-messaging\n- format\n- nuxt.js\n- odoo\n- db2\n- jquery-plugins\n- event-handling\n- julia\n- jenkins-pipeline\n- leaflet\n- annotations\n- flutter-layout\n- nestjs\n- keyboard\n- postman\n- textbox\n- arm\n- stripe-payments\n- visual-studio-2017\n- gulp\n- libgdx\n- uikit\n- synchronization\n- timezone\n- azure-web-app-service\n- dom-events\n- wso2\n- xampp\n- crystal-reports\n- google-sheets-formula\n- namespaces\n- aggregation-framework\n- swagger\n- uiscrollview\n- android-emulator\n- jvm\n- sequelize.js\n- chart.js\n- com\n- snowflake-cloud-data-platform\n- subprocess\n- geolocation\n- webdriver\n- html5-canvas\n- garbage-collection\n- sql-update\n- centos\n- dialog\n- concatenation\n- numbers\n- widget\n- qml\n- tuples\n- set\n- java-stream\n- mapreduce\n- ionic2\n- smtp\n- windows-10\n- rotation\n- android-edittext\n- nuget\n- spring-data\n- modal-dialog\n- radio-button\n- doctrine\n- http-headers\n- grid\n- lucene\n- sonarqube\n- xmlhttprequest\n- listbox\n- switch-statement\n- initialization\n- internationalization\n- components\n- boolean\n- apache-camel\n- google-play\n- gdb\n- serial-port\n- ios5\n- ldap\n- return\n- youtube-api\n- pivot\n- latex\n- eclipse-plugin\n- tags\n- frameworks\n- containers\n- c++17\n- github-actions\n- subquery\n- dataset\n- embedded\n- foreign-keys\n- asp-classic\n- label\n- uinavigationcontroller\n- delegates\n- copy\n- google-cloud-storage\n- struts2\n- migration\n- protractor\n- base64\n- uibutton\n- queue\n- find\n- sql-server-2008-r2\n- arguments\n- composer-php\n- append\n- jaxb\n- stack\n- zip\n- tailwind-css\n- cucumber\n- autolayout\n- ide\n- entity-framework-6\n- iteration\n- popup\n- r-markdown\n- windows-7\n- vb6\n- airflow\n- g++\n- clang\n- ssl-certificate\n- hover\n- jqgrid\n- range\n- gmail\n\nNext\n\nYou’ll be prompted to create an account to view your personalized homepage.\n\n1. 1. [Home](https:\/\/stackoverflow.com\/)\n   2. [Questions](https:\/\/stackoverflow.com\/questions)\n   3. [AI Assist](https:\/\/stackoverflow.com\/ai-assist)\n   4. [Tags](https:\/\/stackoverflow.com\/tags)\n   5. [Challenges](https:\/\/stackoverflow.com\/beta\/challenges)\n   6. [Chat](https:\/\/chat.stackoverflow.com\/?tab=explore)\n   7. [Articles](https:\/\/stackoverflow.blog\/contributed?utm_medium=referral&utm_source=stackoverflow-community&utm_campaign=so-blog&utm_content=experiment-articles)\n   8. [Users](https:\/\/stackoverflow.com\/users)\n   9. [Companies](https:\/\/stackoverflow.com\/jobs\/companies?so_medium=stackoverflow&so_source=SiteNav)\n   10. [Collectives]()\n   11. Communities for your favorite technologies. [Explore all Collectives](https:\/\/stackoverflow.com\/collectives-all)\n2. Stack Internal\n   Stack Overflow for Teams is now called **Stack Internal**. Bring the best of human thought and AI automation together at your work.\n   \n   [Try for free](https:\/\/stackoverflowteams.com\/teams\/create\/free\/?utm_medium=referral&utm_source=stackoverflow-community&utm_campaign=side-bar&utm_content=explore-teams) [Learn more](https:\/\/stackoverflow.co\/internal\/?utm_medium=referral&utm_source=stackoverflow-community&utm_campaign=side-bar&utm_content=explore-teams)\n3. [Stack Internal]()\n4. Bring the best of human thought and AI automation together at your work. [Learn more](https:\/\/stackoverflow.co\/internal\/?utm_medium=referral&utm_source=stackoverflow-community&utm_campaign=side-bar&utm_content=explore-teams-compact)\n\n##### Collectives™ on Stack Overflow\nFind centralized, trusted content and collaborate around the technologies you use most.\n\n[Learn more about Collectives](https:\/\/stackoverflow.com\/collectives)\n\n**Stack Internal**\n\nKnowledge at work\n\nBring the best of human thought and AI automation together at your work.\n\n[Explore Stack Internal](https:\/\/stackoverflow.co\/internal\/?utm_medium=referral&utm_source=stackoverflow-community&utm_campaign=side-bar&utm_content=explore-teams-compact-popover)\n\n# [Remove NaN value from a set](https:\/\/stackoverflow.com\/questions\/37147735\/remove-nan-value-from-a-set)\n[Ask Question](https:\/\/stackoverflow.com\/questions\/ask)\n\nAsked\n\n9 years, 8 months ago\n\nModified [2 years, 5 months ago](https:\/\/stackoverflow.com\/questions\/37147735\/remove-nan-value-from-a-set?lastactivity \"2023-08-02 08:14:04Z\")\n\nViewed 28k times\n\nThis question shows research effort; it is useful and clear\n\n26\n\nSave this question.\n\nShow activity on this post.\n\nIs it possible to easily remove NaN values for a Python Set object? Given that NaN values do not equal anything (and `float('nan') is float('nan')` is also `False`), you can end up with many NaN values in a Set.\n```\nCopy\n```\nThe best I can come up with it to define a function like math.isnan, but that is tolerant of non-float types like:\n```\nCopy\n```\nThen you can use a set comprehension like this:\n```\nCopy\n```\n\n- [python](https:\/\/stackoverflow.com\/questions\/tagged\/python \"show questions tagged 'python'\")\n\n[Share](https:\/\/stackoverflow.com\/q\/37147735 \"Short permalink to this question\")\n\nShare a link to this question\n\nCopy link\n\n[CC BY-SA 3.0](https:\/\/creativecommons.org\/licenses\/by-sa\/3.0\/ \"The current license for this post: CC BY-SA 3.0\")\n\n[Improve this question](https:\/\/stackoverflow.com\/posts\/37147735\/edit)\n\nFollow\n\nFollow this question to receive notifications\n\nasked May 10, 2016 at 19:52\n\n[![Brad Campbell's user avatar](https:\/\/i.sstatic.net\/k7x3R.png?s=64)](https:\/\/stackoverflow.com\/users\/1231055\/brad-campbell)\n\n[Brad Campbell](https:\/\/stackoverflow.com\/users\/1231055\/brad-campbell)\n\n3,11122 gold badges2525 silver badges2525 bronze badges\n\n6\n\n- 1\n  Putting NaNs in a set in the first place is a bad idea. They violate the assumptions a set is built upon.\n  \n  user2357112\n  \n  – [user2357112](https:\/\/stackoverflow.com\/users\/2357112\/user2357112 \"286,393 reputation\")\n  \n  2016-05-10 19:56:36 +00:00\n  \n  [Commented May 10, 2016 at 19:56](https:\/\/stackoverflow.com\/questions\/37147735\/remove-nan-value-from-a-set#comment61833556_37147735)\n- What is the question?\n  \n  Valentin Lorentz\n  \n  – [Valentin Lorentz](https:\/\/stackoverflow.com\/users\/539465\/valentin-lorentz \"9,782 reputation\")\n  \n  2016-05-10 20:25:45 +00:00\n  \n  [Commented May 10, 2016 at 20:25](https:\/\/stackoverflow.com\/questions\/37147735\/remove-nan-value-from-a-set#comment61834501_37147735)\n- @ValentinLorentz Maybe the sentence that ends with a question mark?\n  \n  Stefan Pochmann\n  \n  – [Stefan Pochmann](https:\/\/stackoverflow.com\/users\/1672429\/stefan-pochmann \"29,019 reputation\")\n  \n  2016-05-10 20:27:10 +00:00\n  \n  [Commented May 10, 2016 at 20:27](https:\/\/stackoverflow.com\/questions\/37147735\/remove-nan-value-from-a-set#comment61834544_37147735)\n- @StefanPochmann It is answered at the end of the post\n  \n  Valentin Lorentz\n  \n  – [Valentin Lorentz](https:\/\/stackoverflow.com\/users\/539465\/valentin-lorentz \"9,782 reputation\")\n  \n  2016-05-10 20:29:00 +00:00\n  \n  [Commented May 10, 2016 at 20:29](https:\/\/stackoverflow.com\/questions\/37147735\/remove-nan-value-from-a-set#comment61834599_37147735)\n- 1\n  @user2357112 Yes, that was my conclusion. If you can't test something for equality, you can't really use them in sets. But, other than defining a function like in the question, I could not find another way to get them out of a set.\n  \n  Brad Campbell\n  \n  – [Brad Campbell](https:\/\/stackoverflow.com\/users\/1231055\/brad-campbell \"3,111 reputation\")\n  \n  2016-05-10 20:38:04 +00:00\n  \n  [Commented May 10, 2016 at 20:38](https:\/\/stackoverflow.com\/questions\/37147735\/remove-nan-value-from-a-set#comment61834904_37147735)\n\n\\|   [Show **1** more comment](https:\/\/stackoverflow.com\/questions\/37147735\/remove-nan-value-from-a-set \"Expand to show all comments on this post\")\n\n## 5 Answers 5\nSorted by:\n\n[Reset to default](https:\/\/stackoverflow.com\/questions\/37147735\/remove-nan-value-from-a-set?answertab=scoredesc#tab-top)\n\nThis answer is useful\n\n21\n\nSave this answer.\n\nShow activity on this post.\n\nIn practice, you could look at the fact that `nan != nan` as a feature, not a bug:\n```\nCopy\n```\nOn the positive side, no need for a helper function. On the negative side, if you have a non-nan object which is also not equal to itself, you'll remove that too.\n\n[Share](https:\/\/stackoverflow.com\/a\/37148508 \"Short permalink to this answer\")\n\nShare a link to this answer\n\nCopy link\n\n[CC BY-SA 3.0](https:\/\/creativecommons.org\/licenses\/by-sa\/3.0\/ \"The current license for this post: CC BY-SA 3.0\")\n\n[Improve this answer](https:\/\/stackoverflow.com\/posts\/37148508\/edit)\n\nFollow\n\nFollow this answer to receive notifications\n\nanswered May 10, 2016 at 20:36\n\n[![DSM's user avatar](https:\/\/i.sstatic.net\/wbe4o.png?s=64)](https:\/\/stackoverflow.com\/users\/487339\/dsm)\n\n[DSM](https:\/\/stackoverflow.com\/users\/487339\/dsm)\n\n355k6767 gold badges606606 silver badges504504 bronze badges\n\nSign up to request clarification or add additional context in comments.\n\n## 1 Comment\nAdd a comment\n\n[![](https:\/\/i.sstatic.net\/k7x3R.png?s=64)](https:\/\/stackoverflow.com\/users\/1231055\/brad-campbell)\n\nBrad Campbell\n\n[Brad Campbell](https:\/\/stackoverflow.com\/users\/1231055\/brad-campbell)\n\n[Over a year ago](https:\/\/stackoverflow.com\/questions\/37147735\/remove-nan-value-from-a-set#comment61835098_37148508)\n\nI knew there had to be some way with resorting to the helper function. Thanks\\!\n\n2016-05-10T20:43:04.593Z+00:00\n\n0\n\nReply\n\n- Copy link\n\nThis answer is useful\n\n8\n\nSave this answer.\n\nShow activity on this post.\n\nUse [pd.notna()](https:\/\/pandas.pydata.org\/docs\/reference\/api\/pandas.notna.html#pandas.notna) from pandas, e.g.:\n```\nCopy\n```\n\n[Share](https:\/\/stackoverflow.com\/a\/53346628 \"Short permalink to this answer\")\n\nShare a link to this answer\n\nCopy link\n\n[CC BY-SA 4.0](https:\/\/creativecommons.org\/licenses\/by-sa\/4.0\/ \"The current license for this post: CC BY-SA 4.0\")\n\n[Improve this answer](https:\/\/stackoverflow.com\/posts\/53346628\/edit)\n\nFollow\n\nFollow this answer to receive notifications\n\n[edited Oct 9, 2022 at 16:36](https:\/\/stackoverflow.com\/posts\/53346628\/revisions \"show all edits to this post\")\n\nanswered Nov 16, 2018 at 23:20\n\n[![Pawel Kranzberg's user avatar](https:\/\/i.sstatic.net\/CUWoq.png?s=64)](https:\/\/stackoverflow.com\/users\/3523176\/pawel-kranzberg)\n\n[Pawel Kranzberg](https:\/\/stackoverflow.com\/users\/3523176\/pawel-kranzberg)\n\n1,3291616 silver badges1717 bronze badges\n\n## Comments\nAdd a comment\n\nThis answer is useful\n\n4\n\nSave this answer.\n\nShow activity on this post.\n\nAlso you can use `filter`:\n```\nCopy\n```\n\n[Share](https:\/\/stackoverflow.com\/a\/37148509 \"Short permalink to this answer\")\n\nShare a link to this answer\n\nCopy link\n\n[CC BY-SA 3.0](https:\/\/creativecommons.org\/licenses\/by-sa\/3.0\/ \"The current license for this post: CC BY-SA 3.0\")\n\n[Improve this answer](https:\/\/stackoverflow.com\/posts\/37148509\/edit)\n\nFollow\n\nFollow this answer to receive notifications\n\nanswered May 10, 2016 at 20:36\n\n[![ej\\_f's user avatar](https:\/\/i.sstatic.net\/6I9kD.png?s=64)](https:\/\/stackoverflow.com\/users\/2635790\/ej-f)\n\n[ej\\_f](https:\/\/stackoverflow.com\/users\/2635790\/ej-f)\n\n46033 silver badges99 bronze badges\n\n## Comments\nAdd a comment\n\nThis answer is useful\n\n3\n\nSave this answer.\n\nShow activity on this post.\n\nWe can simply use the .remove() method\n```\nCopy\n```\n\n[Share](https:\/\/stackoverflow.com\/a\/64380141 \"Short permalink to this answer\")\n\nShare a link to this answer\n\nCopy link\n\n[CC BY-SA 4.0](https:\/\/creativecommons.org\/licenses\/by-sa\/4.0\/ \"The current license for this post: CC BY-SA 4.0\")\n\n[Improve this answer](https:\/\/stackoverflow.com\/posts\/64380141\/edit)\n\nFollow\n\nFollow this answer to receive notifications\n\n[edited Oct 22, 2020 at 11:23](https:\/\/stackoverflow.com\/posts\/64380141\/revisions \"show all edits to this post\")\n\nanswered Oct 15, 2020 at 21:49\n\n[![Benoît Lebreton's user avatar](https:\/\/lh4.googleusercontent.com\/-jiaPjTM_z4g\/AAAAAAAAAAI\/AAAAAAAAAAA\/AMZuucnsY6obpIKmaUdY2D7LyjZg19vevw\/s96-c\/s64-rj\/photo.jpg)](https:\/\/stackoverflow.com\/users\/14459006\/beno%C3%AEt-lebreton)\n\n[Benoît Lebreton](https:\/\/stackoverflow.com\/users\/14459006\/beno%C3%AEt-lebreton)\n\n4122 bronze badges\n\n## 3 Comments\nAdd a comment\n\n[![](https:\/\/i.sstatic.net\/q4sxe.jpg?s=64)](https:\/\/stackoverflow.com\/users\/5604562\/grayrigel)\n\nGrayrigel\n\n[Grayrigel](https:\/\/stackoverflow.com\/users\/5604562\/grayrigel)\n\n[Over a year ago](https:\/\/stackoverflow.com\/questions\/37147735\/remove-nan-value-from-a-set#comment113842952_64380141)\n\nPlease consider add some explanation\/comments to the code.\n\n2020-10-15T22:47:25.62Z+00:00\n\n1\n\nReply\n\n- Copy link\n\n[![](https:\/\/i.sstatic.net\/CUWoq.png?s=64)](https:\/\/stackoverflow.com\/users\/3523176\/pawel-kranzberg)\n\nPawel Kranzberg\n\n[Pawel Kranzberg](https:\/\/stackoverflow.com\/users\/3523176\/pawel-kranzberg)\n\n[Over a year ago](https:\/\/stackoverflow.com\/questions\/37147735\/remove-nan-value-from-a-set#comment114958460_64380141)\n\nAs @Fre\\_der\\_ik noted, `remove()` will raise an error if there is no NaN in the set. Use `discard()` instead.\n\n2020-11-26T15:13:12.77Z+00:00\n\n2\n\nReply\n\n- Copy link\n\n[![](https:\/\/i.sstatic.net\/BOHgQ.png?s=64)](https:\/\/stackoverflow.com\/users\/11112772\/md-sabbir-ahmed)\n\nMd Sabbir Ahmed\n\n[Md Sabbir Ahmed](https:\/\/stackoverflow.com\/users\/11112772\/md-sabbir-ahmed)\n\n[Over a year ago](https:\/\/stackoverflow.com\/questions\/37147735\/remove-nan-value-from-a-set#comment117007707_64380141)\n\n@Benoît Lebreton Your answer helped me a lot.\n\n2021-02-13T07:33:12.087Z+00:00\n\n0\n\nReply\n\n- Copy link\n\nAdd a comment\n\nThis answer is useful\n\n0\n\nSave this answer.\n\nShow activity on this post.\n\nI cannot make a comment, so I combine the answers above, with some explanation (for beginners). Create a set, including NaN (numpy.nan value)\n```\nCopy\n```\nCheck the created set as result:\n```\nCopy\n```\nDiscard (better then remove which could lead to KeyError if there is non NaN in the set) NaNs:\n```\nCopyIn[4]: a.discard(np.nan)\n```\nCheck the result:\n```\nCopy\n```\n\n[Share](https:\/\/stackoverflow.com\/a\/76817869 \"Short permalink to this answer\")\n\nShare a link to this answer\n\nCopy link\n\n[CC BY-SA 4.0](https:\/\/creativecommons.org\/licenses\/by-sa\/4.0\/ \"The current license for this post: CC BY-SA 4.0\")\n\n[Improve this answer](https:\/\/stackoverflow.com\/posts\/76817869\/edit)\n\nFollow\n\nFollow this answer to receive notifications\n\nanswered Aug 2, 2023 at 8:14\n\n[![QMCM's user avatar](https:\/\/lh3.googleusercontent.com\/a\/AATXAJzFBrVsqX4qyA9Bgp88xUZelZT4G0_iPnwtCrDK=k-s64)](https:\/\/stackoverflow.com\/users\/19204830\/qmcm)\n\n[QMCM](https:\/\/stackoverflow.com\/users\/19204830\/qmcm)\n\n4144 bronze badges\n\n## Comments\nAdd a comment\n\nStart asking to get answers\n\nFind the answer to your question by asking.\n\n[Ask question](https:\/\/stackoverflow.com\/questions\/ask)\n\nExplore related questions\n\n- [python](https:\/\/stackoverflow.com\/questions\/tagged\/python \"show questions tagged 'python'\")\n\nSee similar questions with these tags.\n\n- The Overflow Blog\n- [If you're a Zoomer, this one's for you: Everything Gen Z needs to know about...](https:\/\/stackoverflow.blog\/2026\/01\/14\/gen-z-wrapped-2025\/?cb=1 \"If you're a Zoomer, this one's for you: Everything Gen Z needs to know about the 2025 tech landscape\")\n- [How Stack Overflow is taking on spam and bad actors](https:\/\/stackoverflow.blog\/2026\/01\/15\/how-stack-overflow-is-taking-on-spam-and-bad-actors\/?cb=1)\n- Featured on Meta\n- [A proposal for bringing back Community Promotion & Open Source Ads](https:\/\/meta.stackexchange.com\/questions\/416429\/a-proposal-for-bringing-back-community-promotion-open-source-ads?cb=1)\n- [Community Asks Sprint Announcement – January 2026: Custom site-specific badges\\!](https:\/\/meta.stackexchange.com\/questions\/416734\/community-asks-sprint-announcement-january-2026-custom-site-specific-badges?cb=1)\n- [Policy: Generative AI (e.g., ChatGPT) is banned](https:\/\/meta.stackoverflow.com\/questions\/421831\/policy-generative-ai-e-g-chatgpt-is-banned?cb=1)\n- [All users on Stack Overflow can now participate in chat](https:\/\/meta.stackoverflow.com\/questions\/437932\/all-users-on-stack-overflow-can-now-participate-in-chat?cb=1)\n- [Should Stack Overflow utilize machine learning anti-spam?](https:\/\/meta.stackoverflow.com\/questions\/437959\/should-stack-overflow-utilize-machine-learning-anti-spam?cb=1)\n\nCommunity activity\n\nLast 1 hr\n\n- Users online activity\n  4989 users online\n- 9 questions\n- 8 answers\n- 21 comments\n- 83 upvotes\n\nPopular tags\n\n[sql](https:\/\/stackoverflow.com\/questions\/tagged\/sql)[mysql](https:\/\/stackoverflow.com\/questions\/tagged\/mysql)[java](https:\/\/stackoverflow.com\/questions\/tagged\/java)[python](https:\/\/stackoverflow.com\/questions\/tagged\/python)[prisma](https:\/\/stackoverflow.com\/questions\/tagged\/prisma)\n\n#### Linked\n[2](https:\/\/stackoverflow.com\/questions\/45978058\/return-nan-from-indexing-operation-on-a-pandas-series?lq=1 \"Question score (upvotes - downvotes)\")\n\n[Return NaN from indexing operation on a pandas series](https:\/\/stackoverflow.com\/questions\/45978058\/return-nan-from-indexing-operation-on-a-pandas-series?noredirect=1&lq=1)\n\n#### Related\n[5664](https:\/\/stackoverflow.com\/questions\/522563\/how-can-i-access-the-index-value-in-a-for-loop?rq=1 \"Question score (upvotes - downvotes)\")\n\n[How can I access the index value in a 'for' loop?](https:\/\/stackoverflow.com\/questions\/522563\/how-can-i-access-the-index-value-in-a-for-loop?rq=1)\n\n[3013](https:\/\/stackoverflow.com\/questions\/11277432\/how-can-i-remove-a-key-from-a-python-dictionary?rq=1 \"Question score (upvotes - downvotes)\")\n\n[How can I remove a key from a Python dictionary?](https:\/\/stackoverflow.com\/questions\/11277432\/how-can-i-remove-a-key-from-a-python-dictionary?rq=1)\n\n[3413](https:\/\/stackoverflow.com\/questions\/613183\/how-do-i-sort-a-dictionary-by-value?rq=1 \"Question score (upvotes - downvotes)\")\n\n[How do I sort a dictionary by value?](https:\/\/stackoverflow.com\/questions\/613183\/how-do-i-sort-a-dictionary-by-value?rq=1)\n\n[2345](https:\/\/stackoverflow.com\/questions\/627435\/how-to-remove-an-element-from-a-list-by-index?rq=1 \"Question score (upvotes - downvotes)\")\n\n[How to remove an element from a list by index](https:\/\/stackoverflow.com\/questions\/627435\/how-to-remove-an-element-from-a-list-by-index?rq=1)\n\n[1723](https:\/\/stackoverflow.com\/questions\/944700\/how-to-check-for-nan-values?rq=1 \"Question score (upvotes - downvotes)\")\n\n[How to check for NaN values](https:\/\/stackoverflow.com\/questions\/944700\/how-to-check-for-nan-values?rq=1)\n\n[3628](https:\/\/stackoverflow.com\/questions\/17071871\/how-do-i-select-rows-from-a-dataframe-based-on-column-values?rq=1 \"Question score (upvotes - downvotes)\")\n\n[How do I select rows from a DataFrame based on column values?](https:\/\/stackoverflow.com\/questions\/17071871\/how-do-i-select-rows-from-a-dataframe-based-on-column-values?rq=1)\n\n[2077](https:\/\/stackoverflow.com\/questions\/275018\/how-can-i-remove-a-trailing-newline?rq=1 \"Question score (upvotes - downvotes)\")\n\n[How can I remove a trailing newline?](https:\/\/stackoverflow.com\/questions\/275018\/how-can-i-remove-a-trailing-newline?rq=1)\n\n[2663](https:\/\/stackoverflow.com\/questions\/4383571\/importing-files-from-different-folder?rq=1 \"Question score (upvotes - downvotes)\")\n\n[Importing files from different folder](https:\/\/stackoverflow.com\/questions\/4383571\/importing-files-from-different-folder?rq=1)\n\n[1477](https:\/\/stackoverflow.com\/questions\/13413590\/how-to-drop-rows-of-pandas-dataframe-whose-value-in-a-certain-column-is-nan?rq=1 \"Question score (upvotes - downvotes)\")\n\n[How to drop rows of Pandas DataFrame whose value in a certain column is NaN](https:\/\/stackoverflow.com\/questions\/13413590\/how-to-drop-rows-of-pandas-dataframe-whose-value-in-a-certain-column-is-nan?rq=1)\n\n#### [Hot Network Questions](https:\/\/stackexchange.com\/questions?tab=hot)\n- [Are achievements bugged in Sludge Life 2?](https:\/\/gaming.stackexchange.com\/questions\/417620\/are-achievements-bugged-in-sludge-life-2)\n- [Can I pigtail \\#14\/2 wire off \\#8\/3 gauge to run 3 receptacles?](https:\/\/diy.stackexchange.com\/questions\/328613\/can-i-pigtail-14-2-wire-off-8-3-gauge-to-run-3-receptacles)\n- [How is the recursion principle for Acc generated by Rocq?](https:\/\/proofassistants.stackexchange.com\/questions\/6447\/how-is-the-recursion-principle-for-acc-generated-by-rocq)\n- [Do 40% of Australian teenage boys support “right-wing violent extremism”?](https:\/\/skeptics.stackexchange.com\/questions\/60427\/do-40-of-australian-teenage-boys-support-right-wing-violent-extremism)\n- [English idiom about a new item breaking down or getting lost upon acquisition](https:\/\/english.stackexchange.com\/questions\/638603\/english-idiom-about-a-new-item-breaking-down-or-getting-lost-upon-acquisition)\n- [Could reality exist without logic? Could reality be illogical?](https:\/\/philosophy.stackexchange.com\/questions\/135280\/could-reality-exist-without-logic-could-reality-be-illogical)\n- [Bending Paper with IK Bones](https:\/\/blender.stackexchange.com\/questions\/344524\/bending-paper-with-ik-bones)\n- [How to define file-based indentation rules in Kate?](https:\/\/unix.stackexchange.com\/questions\/803767\/how-to-define-file-based-indentation-rules-in-kate)\n- [Strong Linear Correlation but Highly Patterned Residuals](https:\/\/stats.stackexchange.com\/questions\/674341\/strong-linear-correlation-but-highly-patterned-residuals)\n- [78xx adjustable voltage circuit not working](https:\/\/electronics.stackexchange.com\/questions\/764456\/78xx-adjustable-voltage-circuit-not-working)\n- [Another definite integral](https:\/\/mathoverflow.net\/questions\/507034\/another-definite-integral)\n- [Does GPL require code-sharing to be specific to the product, or can a company lump all GPL software in one non-specific place?](https:\/\/opensource.stackexchange.com\/questions\/15694\/does-gpl-require-code-sharing-to-be-specific-to-the-product-or-can-a-company-lu)\n- [Why adding titlesec makes links in toc inside PDF no longer work when using \\\\setcounter{secnumdepth}{0}?](https:\/\/tex.stackexchange.com\/questions\/758333\/why-adding-titlesec-makes-links-in-toc-inside-pdf-no-longer-work-when-using-set)\n- [Hierarchical lists in ConTeXt?](https:\/\/tex.stackexchange.com\/questions\/758336\/hierarchical-lists-in-context)\n- [Periodic Updates for User Control Types (E.g. DataGrid\/TextBoxes\/etc) from DB in WPF with MVVM pattern?](https:\/\/softwareengineering.stackexchange.com\/questions\/460710\/periodic-updates-for-user-control-types-e-g-datagrid-textboxes-etc-from-db-in)\n- [Files with identical name in the same directory](https:\/\/unix.stackexchange.com\/questions\/803744\/files-with-identical-name-in-the-same-directory)\n- [Is working on and publishing \"grunt math\" acceptable as a high school student?](https:\/\/academia.stackexchange.com\/questions\/225638\/is-working-on-and-publishing-grunt-math-acceptable-as-a-high-school-student)\n- [Origin of “sch” in German writing](https:\/\/german.stackexchange.com\/questions\/82038\/origin-of-sch-in-german-writing)\n- [What is \"social freedom\"?](https:\/\/politics.stackexchange.com\/questions\/94073\/what-is-social-freedom)\n- [Why was Gold 5 apparently giving orders to Gold Leader during the first trench run?](https:\/\/scifi.stackexchange.com\/questions\/302848\/why-was-gold-5-apparently-giving-orders-to-gold-leader-during-the-first-trench-r)\n- [Interpreting それへの妥当性](https:\/\/japanese.stackexchange.com\/questions\/111664\/interpreting-%E3%81%9D%E3%82%8C%E3%81%B8%E3%81%AE%E5%A6%A5%E5%BD%93%E6%80%A7)\n- [Long term side effect of cryosleep](https:\/\/worldbuilding.stackexchange.com\/questions\/272347\/long-term-side-effect-of-cryosleep)\n- [What is \"interception\" of transactions in the BTCPuzzle case?](https:\/\/bitcoin.stackexchange.com\/questions\/130427\/what-is-interception-of-transactions-in-the-btcpuzzle-case)\n- [How Should I Write a Series of Thoughts being Interrupted?](https:\/\/writing.stackexchange.com\/questions\/72129\/how-should-i-write-a-series-of-thoughts-being-interrupted)\n\n[Question feed](https:\/\/stackoverflow.com\/feeds\/question\/37147735 \"Feed of this question and its answers\")\n\n# Subscribe to RSS\nQuestion feed\n\nTo subscribe to this RSS feed, copy and paste this URL into your RSS reader.\n\n![](https:\/\/stackoverflow.com\/posts\/37147735\/ivc\/81c6?prg=c72006dd-7b7f-47dc-b887-7e48bb86cafa)\n\nlang-py\n\n# Why are you flagging this comment?\nProbable spam.\n\nThis comment promotes a product, service or website while [failing to disclose the author's affiliation](https:\/\/stackoverflow.com\/help\/promotion).\n\nUnfriendly or contains harassment\/bigotry\/abuse.\n\nThis comment is unkind, insulting or attacks another person or group. Learn more in our [Abusive behavior policy](https:\/\/stackoverflow.com\/conduct\/abusive-behavior).\n\nNot needed.\n\nThis comment is not relevant to the post.\n\n```\n\n```\nEnter at least 6 characters\n\nSomething else.\n\nA problem not listed above. Try to be as specific as possible.\n\n```\n\n```\nEnter at least 6 characters\n\nFlag comment\n\nCancel\n\nYou have 0 flags left today\n\n# ![Illustration of upvote icon after it is clicked](https:\/\/stackoverflow.com\/Content\/Img\/modal\/img-upvote.png?v=fce73bd9724d)\n# Hang on, you can't upvote just yet.\nYou'll need to complete a few actions and gain 15 reputation points before being able to upvote. **Upvoting** indicates when questions and answers are useful. [What's reputation and how do I get it?](https:\/\/stackoverflow.com\/help\/whats-reputation)\n\nInstead, you can save this post to reference later.\n\nSave this post for later\n\nNot now\n\n##### [Stack Overflow](https:\/\/stackoverflow.com\/)\n- [Questions](https:\/\/stackoverflow.com\/questions)\n- [Help](https:\/\/stackoverflow.com\/help)\n- [Chat](https:\/\/chat.stackoverflow.com\/?tab=explore)\n\n##### [Business](https:\/\/stackoverflow.co\/)\n- [Stack Internal](https:\/\/stackoverflow.co\/internal\/?utm_medium=referral&utm_source=stackoverflow-community&utm_campaign=footer&utm_content=teams)\n- [Stack Data Licensing](https:\/\/stackoverflow.co\/data-licensing\/?utm_medium=referral&utm_source=stackoverflow-community&utm_campaign=footer&utm_content=data-licensing)\n- [Stack Ads](https:\/\/stackoverflow.co\/advertising\/?utm_medium=referral&utm_source=stackoverflow-community&utm_campaign=footer&utm_content=advertising)\n\n##### [Company](https:\/\/stackoverflow.co\/)\n- [About](https:\/\/stackoverflow.co\/)\n- [Press](https:\/\/stackoverflow.co\/company\/press\/)\n- [Work Here](https:\/\/stackoverflow.co\/company\/work-here\/)\n- [Legal](https:\/\/stackoverflow.com\/legal)\n- [Privacy Policy](https:\/\/stackoverflow.com\/legal\/privacy-policy)\n- [Terms of Service](https:\/\/stackoverflow.com\/legal\/terms-of-service\/public)\n- [Contact Us](https:\/\/stackoverflow.com\/contact)\n- Cookie Settings\n- [Cookie Policy](https:\/\/policies.stackoverflow.co\/stack-overflow\/cookie-policy)\n\n##### [Stack Exchange Network](https:\/\/stackexchange.com\/)\n- [Technology](https:\/\/stackexchange.com\/sites#technology)\n- [Culture & recreation](https:\/\/stackexchange.com\/sites#culturerecreation)\n- [Life & arts](https:\/\/stackexchange.com\/sites#lifearts)\n- [Science](https:\/\/stackexchange.com\/sites#science)\n- [Professional](https:\/\/stackexchange.com\/sites#professional)\n- [Business](https:\/\/stackexchange.com\/sites#business)\n- [API](https:\/\/api.stackexchange.com\/)\n- [Data](https:\/\/data.stackexchange.com\/)\n\n- [Blog](https:\/\/stackoverflow.blog\/?blb=1)\n- [Facebook](https:\/\/www.facebook.com\/officialstackoverflow\/)\n- [Twitter](https:\/\/twitter.com\/stackoverflow)\n- [LinkedIn](https:\/\/linkedin.com\/company\/stack-overflow)\n- [Instagram](https:\/\/www.instagram.com\/thestackoverflow)\n\nSite design \/ logo © 2026 Stack Exchange Inc;  user contributions licensed under  [CC BY-SA](https:\/\/stackoverflow.com\/help\/licensing) .  rev 2026.1.14.38635","attrs_readable_markdown":null,"meta_canonical":null}

3. Robots.txt Check

Query:

Response:

4. Spam/Ban Check

Query:

Response:

5. Seen Status Check

ℹ️ Skipped - page is already crawled

📄

INDEXABLE

✅

CRAWLED

2 months ago

🤖

ROBOTS ALLOWED

Page Info Filters

Filter	Status	Condition	Details
HTTP status	PASS	`download_http_code = 200`	HTTP 200
Age cutoff	PASS	`download_stamp > now() - 6 MONTH`	2.7 months ago
History drop	PASS	`isNull(history_drop_reason)`	No drop reason
Spam/ban	PASS	`fh_dont_index != 1 AND ml_spam_score = 0`	ml_spam_score=0
Canonical	PASS	`meta_canonical IS NULL OR = '' OR = src_unparsed`	Not set

Page Details

Property	Value
URL	https://stackoverflow.com/questions/37147735/remove-nan-value-from-a-set
Last Crawled	2026-01-16 04:25:13 (2 months ago)
First Indexed	not set
HTTP Status Code	200
Meta Title	python - Remove NaN value from a set - Stack Overflow
Meta Description	null
Meta Canonical	null
Boilerpipe Text	This question shows research effort; it is useful and clear 26 Save this question. Show activity on this post. Is it possible to easily remove NaN values for a Python Set object? Given that NaN values do not equal anything (and float('nan') is float('nan') is also False ), you can end up with many NaN values in a Set. >>> a = set ( ( float ( 'nan' ), float ( 'nan' ), 'a' ) ) >>> a {nan, nan, 'a' } The best I can come up with it to define a function like math.isnan, but that is tolerant of non-float types like: def my_isnan ( x ): try : return math.isnan(x) except TypeError: return False Then you can use a set comprehension like this: >>> {x for x in a if not my_isnan(x)} { 'a' } asked May 10, 2016 at 19:52 6 This answer is useful 21 Save this answer. Show activity on this post. In practice, you could look at the fact that nan != nan as a feature, not a bug: >>> a = { float ( 'nan' ), float ( 'nan' ), 'a' } >>> a {nan, nan, 'a' } >>> {x for x in a if x==x} { 'a' } On the positive side, no need for a helper function. On the negative side, if you have a non-nan object which is also not equal to itself, you'll remove that too. answered May 10, 2016 at 20:36 1 Comment I knew there had to be some way with resorting to the helper function. Thanks! 2016-05-10T20:43:04.593Z+00:00 This answer is useful 8 Save this answer. Show activity on this post. Use pd.notna() from pandas, e.g.: In [ 219 ]: import pandas as pd In [ 220 ]: a = set (( float ( 'nan' ), float ( 'nan' ), 'a' )) In [ 221 ]: a = {x for x in a if pd.notna(x)} In [ 222 ]: a Out[ 222 ]: { 'a' } answered Nov 16, 2018 at 23:20 Comments This answer is useful 4 Save this answer. Show activity on this post. Also you can use filter : In[ 75 ]: a = set (( float ( 'nan' ), float ( 'nan' ), 'a' )) In[ 76 ]: set ( filter ( lambda x: x == x , a)) Out[ 76 ]: { 'a' } answered May 10, 2016 at 20:36 ej_f 460 3 silver badges 9 bronze badges Comments This answer is useful 3 Save this answer. Show activity on this post. We can simply use the .remove() method In[ 1 ]: a = set ([np.nan, "A" ]) In[ 2 ]: a Out: { 'A' , nan} In[ 3 ]: a.remove(np.nan) In[ 4 ]: a Out: { 'A' } answered Oct 15, 2020 at 21:49 3 Comments Please consider add some explanation/comments to the code. 2020-10-15T22:47:25.62Z+00:00 As @Fre_der_ik noted, remove() will raise an error if there is no NaN in the set. Use discard() instead. 2020-11-26T15:13:12.77Z+00:00 @Benoît Lebreton Your answer helped me a lot. 2021-02-13T07:33:12.087Z+00:00 This answer is useful 0 Save this answer. Show activity on this post. I cannot make a comment, so I combine the answers above, with some explanation (for beginners). Create a set, including NaN (numpy.nan value) In[ 1 ]: import numpy as np In[ 2 ]: a = set ([np.nan, 'A' ]) Check the created set as result: In[ 3 ]: a Out: { 'A' , nan} Discard (better then remove which could lead to KeyError if there is non NaN in the set) NaNs: In[ 4 ]: a.discard(np.nan) Check the result: In[ 5 ]: a Out: { 'A' } answered Aug 2, 2023 at 8:14 Comments Start asking to get answers Find the answer to your question by asking. Ask question Explore related questions See similar questions with these tags.
Markdown	# ![site logo](https://stackoverflow.com/Content/Img/SE-logo75.png) By clicking “Sign up”, you agree to our [terms of service](https://stackoverflow.com/legal/terms-of-service/public) and acknowledge you have read our [privacy policy](https://stackoverflow.com/legal/privacy-policy). # OR Already have an account? [Log in](https://stackoverflow.com/users/login) [Skip to main content](https://stackoverflow.com/questions/37147735/remove-nan-value-from-a-set#content) [Stack Overflow](https://stackoverflow.com/) 1. [About](https://stackoverflow.co/) 2. Products 3. [For Teams](https://stackoverflow.co/internal/) 1. [Stack Internal Implement a knowledge platform layer to power your enterprise and AI tools.](https://stackoverflow.co/internal/?utm_medium=referral&utm_source=stackoverflow-community&utm_campaign=top-nav&utm_content=stack-overflow-for-teams) 2. [Stack Data Licensing Get access to top-class technical expertise with trusted & attributed content.](https://stackoverflow.co/data-licensing/?utm_medium=referral&utm_source=stackoverflow-community&utm_campaign=top-nav&utm_content=overflow-api) 3. [Stack Ads Connect your brand to the world’s most trusted technologist communities.](https://stackoverflow.co/advertising/?utm_medium=referral&utm_source=stackoverflow-community&utm_campaign=top-nav&utm_content=stack-overflow-advertising) 4. [Releases Keep up-to-date on features we add to Stack Overflow and Stack Internal.](https://stackoverflow.blog/releases/?utm_medium=referral&utm_source=stackoverflow-community&utm_campaign=top-nav&utm_content=releases) 5. [About the company](https://stackoverflow.co/?utm_medium=referral&utm_source=stackoverflow-community&utm_campaign=top-nav&utm_content=about-the-company) [Visit the blog](https://stackoverflow.blog/?utm_medium=referral&utm_source=stackoverflow-community&utm_campaign=top-nav&utm_content=blog) 1. ### [current community](https://stackoverflow.com/) - [Stack Overflow](https://stackoverflow.com/) [help](https://stackoverflow.com/help) [chat](https://chat.stackoverflow.com/?tab=explore) - [Meta Stack Overflow](https://meta.stackoverflow.com/) ### your communities [Sign up](https://stackoverflow.com/users/signup?ssrc=site_switcher&returnurl=https%3A%2F%2Fstackoverflow.com%2Fquestions%2F37147735%2Fremove-nan-value-from-a-set) or [log in](https://stackoverflow.com/users/login?ssrc=site_switcher&returnurl=https%3A%2F%2Fstackoverflow.com%2Fquestions%2F37147735%2Fremove-nan-value-from-a-set) to customize your list. ### [more stack exchange communities](https://stackexchange.com/sites) [company blog](https://stackoverflow.blog/) 2. [Log in](https://stackoverflow.com/users/login?ssrc=head&returnurl=https%3A%2F%2Fstackoverflow.com%2Fquestions%2F37147735%2Fremove-nan-value-from-a-set) 3. [Sign up](https://stackoverflow.com/users/signup?ssrc=head&returnurl=https%3A%2F%2Fstackoverflow.com%2Fquestions%2F37147735%2Fremove-nan-value-from-a-set) # Let's set up your homepage Select a few topics you're interested in: python javascript c\# reactjs java android html flutter c++ node.js typescript css r php angular next.js spring-boot machine-learning sql excel ios azure docker Or search from our full list: - javascript - python - java - c\# - php - android - html - jquery - c++ - css - ios - sql - mysql - r - reactjs - node.js - arrays - c - asp.net - json - python-3.x - .net - ruby-on-rails - sql-server - swift - django - angular - objective-c - excel - pandas - angularjs - regex - typescript - ruby - linux - ajax - iphone - vba - xml - laravel - spring - asp.net-mvc - database - wordpress - string - flutter - postgresql - mongodb - wpf - windows - xcode - amazon-web-services - bash - git - oracle-database - spring-boot - dataframe - azure - firebase - list - multithreading - docker - vb.net - react-native - eclipse - algorithm - powershell - macos - visual-studio - numpy - image - forms - scala - function - vue.js - performance - twitter-bootstrap - selenium - winforms - kotlin - loops - dart - express - hibernate - sqlite - matlab - python-2.7 - shell - rest - apache - entity-framework - android-studio - csv - maven - linq - qt - dictionary - unit-testing - asp.net-core - facebook - apache-spark - tensorflow - file - swing - class - unity-game-engine - sorting - date - authentication - go - symfony - t-sql - opencv - matplotlib - .htaccess - google-chrome - for-loop - datetime - codeigniter - perl - http - validation - sockets - google-maps - object - uitableview - xaml - oop - visual-studio-code - if-statement - cordova - ubuntu - web-services - email - android-layout - github - spring-mvc - elasticsearch - kubernetes - selenium-webdriver - ms-access - ggplot2 - user-interface - parsing - pointers - google-sheets - c++11 - security - machine-learning - google-apps-script - ruby-on-rails-3 - templates - flask - nginx - variables - exception - sql-server-2008 - gradle - debugging - tkinter - delphi - listview - jpa - asynchronous - haskell - web-scraping - pdf - jsp - ssl - amazon-s3 - google-cloud-platform - testing - jenkins - xamarin - wcf - batch-file - generics - npm - ionic-framework - network-programming - unix - recursion - google-app-engine - mongoose - visual-studio-2010 - .net-core - android-fragments - assembly - animation - math - svg - rust - session - intellij-idea - hadoop - join - curl - winapi - django-models - laravel-5 - next.js - url - heroku - http-redirect - tomcat - google-cloud-firestore - inheritance - webpack - gcc - image-processing - swiftui - keras - asp.net-mvc-4 - logging - dom - matrix - pyspark - actionscript-3 - button - post - optimization - firebase-realtime-database - jquery-ui - cocoa - xpath - iis - web - d3.js - javafx - firefox - xslt - internet-explorer - caching - select - asp.net-mvc-3 - opengl - events - asp.net-web-api - plot - dplyr - encryption - magento - stored-procedures - search - amazon-ec2 - ruby-on-rails-4 - memory - canvas - multidimensional-array - audio - random - jsf - vector - redux - cookies - input - facebook-graph-api - flash - indexing - xamarin.forms - arraylist - ipad - cocoa-touch - data-structures - video - model-view-controller - azure-devops - serialization - apache-kafka - jdbc - razor - woocommerce - awk - routes - mod-rewrite - servlets - excel-formula - beautifulsoup - filter - iframe - docker-compose - design-patterns - aws-lambda - text - visual-c++ - django-rest-framework - cakephp - mobile - android-intent - struct - react-hooks - methods - groovy - mvvm - lambda - ssh - time - checkbox - ecmascript-6 - grails - google-chrome-extension - installation - cmake - sharepoint - shiny - spring-security - jakarta-ee - plsql - android-recyclerview - core-data - types - sed - meteor - android-activity - bootstrap-4 - activerecord - websocket - replace - graph - group-by - scikit-learn - vim - file-upload - boost - junit - memory-management - sass - async-await - import - deep-learning - error-handling - eloquent - dynamic - dependency-injection - soap - silverlight - layout - apache-spark-sql - charts - deployment - browser - gridview - svn - while-loop - google-bigquery - vuejs2 - highcharts - dll - ffmpeg - view - foreach - makefile - plugins - redis - c\#-4.0 - reporting-services - jupyter-notebook - unicode - merge - reflection - https - server - google-maps-api-3 - twitter - oauth-2.0 - extjs - terminal - axios - pip - split - cmd - pytorch - encoding - django-views - collections - database-design - hash - netbeans - automation - ember.js - data-binding - build - tcp - pdo - sqlalchemy - apache-flex - entity-framework-core - concurrency - command-line - spring-data-jpa - printing - react-redux - java-8 - lua - html-table - neo4j - ansible - service - mysqli - jestjs - enums - parameters - flexbox - material-ui - module - promise - visual-studio-2012 - outlook - web-applications - uwp - firebase-authentication - webview - jquery-mobile - utf-8 - datatable - python-requests - parallel-processing - colors - drop-down-menu - scipy - scroll - tfs - hive - count - syntax - ms-word - twitter-bootstrap-3 - ssis - fonts - rxjs - constructor - google-analytics - file-io - paypal - three.js - powerbi - graphql - cassandra - discord - graphics - compiler-errors - gwt - react-router - socket.io - backbone.js - solr - memory-leaks - url-rewriting - datatables - nlp - terraform - oauth - datagridview - drupal - zend-framework - oracle11g - triggers - knockout.js - neural-network - interface - django-forms - angular-material - casting - jmeter - linked-list - google-api - path - timer - arduino - django-templates - orm - proxy - directory - windows-phone-7 - parse-platform - visual-studio-2015 - cron - conditional-statements - push-notification - functional-programming - primefaces - pagination - model - jar - xamarin.android - hyperlink - uiview - vbscript - visual-studio-2013 - google-cloud-functions - azure-active-directory - gitlab - jwt - download - swift3 - sql-server-2005 - process - pygame - rspec - configuration - properties - combobox - callback - windows-phone-8 - linux-kernel - safari - scrapy - permissions - emacs - x86 - clojure - scripting - raspberry-pi - io - scope - azure-functions - compilation - expo - responsive-design - mongodb-query - nhibernate - angularjs-directive - reference - binding - bluetooth - request - architecture - dns - playframework - pyqt - 3d - version-control - discord.js - doctrine-orm - package - f\# - rubygems - get - sql-server-2012 - autocomplete - tree - openssl - datepicker - kendo-ui - jackson - yii - controller - grep - nested - xamarin.ios - static - null - transactions - statistics - datagrid - active-directory - dockerfile - uiviewcontroller - webforms - sas - discord.py - computer-vision - phpmyadmin - notifications - duplicates - pycharm - mocking - youtube - yaml - nullpointerexception - menu - blazor - sum - plotly - bitmap - visual-studio-2008 - asp.net-mvc-5 - floating-point - css-selectors - yii2 - stl - electron - android-listview - jsf-2 - time-series - cryptography - ant - hashmap - character-encoding - stream - msbuild - asp.net-core-mvc - sdk - google-drive-api - jboss - selenium-chromedriver - joomla - devise - navigation - cors - cuda - anaconda - frontend - background - multiprocessing - binary - pyqt5 - camera - iterator - linq-to-sql - mariadb - onclick - android-jetpack-compose - ios7 - microsoft-graph-api - android-asynctask - rabbitmq - tabs - amazon-dynamodb - laravel-4 - environment-variables - uicollectionview - insert - linker - xsd - coldfusion - console - continuous-integration - upload - textview - ftp - opengl-es - operating-system - macros - mockito - localization - formatting - xml-parsing - json.net - type-conversion - vuejs3 - data.table - kivy - timestamp - integer - calendar - segmentation-fault - android-ndk - prolog - drag-and-drop - char - crash - jasmine - dependencies - geometry - automated-tests - azure-pipelines - fortran - android-gradle-plugin - itext - sprite-kit - mfc - header - attributes - nosql - firebase-cloud-messaging - format - nuxt.js - odoo - db2 - jquery-plugins - event-handling - julia - jenkins-pipeline - leaflet - annotations - flutter-layout - nestjs - keyboard - postman - textbox - arm - stripe-payments - visual-studio-2017 - gulp - libgdx - uikit - synchronization - timezone - azure-web-app-service - dom-events - wso2 - xampp - crystal-reports - google-sheets-formula - namespaces - aggregation-framework - swagger - uiscrollview - android-emulator - jvm - sequelize.js - chart.js - com - snowflake-cloud-data-platform - subprocess - geolocation - webdriver - html5-canvas - garbage-collection - sql-update - centos - dialog - concatenation - numbers - widget - qml - tuples - set - java-stream - mapreduce - ionic2 - smtp - windows-10 - rotation - android-edittext - nuget - spring-data - modal-dialog - radio-button - doctrine - http-headers - grid - lucene - sonarqube - xmlhttprequest - listbox - switch-statement - initialization - internationalization - components - boolean - apache-camel - google-play - gdb - serial-port - ios5 - ldap - return - youtube-api - pivot - latex - eclipse-plugin - tags - frameworks - containers - c++17 - github-actions - subquery - dataset - embedded - foreign-keys - asp-classic - label - uinavigationcontroller - delegates - copy - google-cloud-storage - struts2 - migration - protractor - base64 - uibutton - queue - find - sql-server-2008-r2 - arguments - composer-php - append - jaxb - stack - zip - tailwind-css - cucumber - autolayout - ide - entity-framework-6 - iteration - popup - r-markdown - windows-7 - vb6 - airflow - g++ - clang - ssl-certificate - hover - jqgrid - range - gmail Next You’ll be prompted to create an account to view your personalized homepage. 1. 1. [Home](https://stackoverflow.com/) 2. [Questions](https://stackoverflow.com/questions) 3. [AI Assist](https://stackoverflow.com/ai-assist) 4. [Tags](https://stackoverflow.com/tags) 5. [Challenges](https://stackoverflow.com/beta/challenges) 6. [Chat](https://chat.stackoverflow.com/?tab=explore) 7. [Articles](https://stackoverflow.blog/contributed?utm_medium=referral&utm_source=stackoverflow-community&utm_campaign=so-blog&utm_content=experiment-articles) 8. [Users](https://stackoverflow.com/users) 9. [Companies](https://stackoverflow.com/jobs/companies?so_medium=stackoverflow&so_source=SiteNav) 10. [Collectives]() 11. Communities for your favorite technologies. [Explore all Collectives](https://stackoverflow.com/collectives-all) 2. Stack Internal Stack Overflow for Teams is now called Stack Internal. Bring the best of human thought and AI automation together at your work. [Try for free](https://stackoverflowteams.com/teams/create/free/?utm_medium=referral&utm_source=stackoverflow-community&utm_campaign=side-bar&utm_content=explore-teams) [Learn more](https://stackoverflow.co/internal/?utm_medium=referral&utm_source=stackoverflow-community&utm_campaign=side-bar&utm_content=explore-teams) 3. [Stack Internal]() 4. Bring the best of human thought and AI automation together at your work. [Learn more](https://stackoverflow.co/internal/?utm_medium=referral&utm_source=stackoverflow-community&utm_campaign=side-bar&utm_content=explore-teams-compact) ##### Collectives™ on Stack Overflow Find centralized, trusted content and collaborate around the technologies you use most. [Learn more about Collectives](https://stackoverflow.com/collectives) Stack Internal Knowledge at work Bring the best of human thought and AI automation together at your work. [Explore Stack Internal](https://stackoverflow.co/internal/?utm_medium=referral&utm_source=stackoverflow-community&utm_campaign=side-bar&utm_content=explore-teams-compact-popover) # [Remove NaN value from a set](https://stackoverflow.com/questions/37147735/remove-nan-value-from-a-set) [Ask Question](https://stackoverflow.com/questions/ask) Asked 9 years, 8 months ago Modified [2 years, 5 months ago](https://stackoverflow.com/questions/37147735/remove-nan-value-from-a-set?lastactivity "2023-08-02 08:14:04Z") Viewed 28k times This question shows research effort; it is useful and clear 26 Save this question. Show activity on this post. Is it possible to easily remove NaN values for a Python Set object? Given that NaN values do not equal anything (and `float('nan') is float('nan')` is also `False`), you can end up with many NaN values in a Set. ``` Copy ``` The best I can come up with it to define a function like math.isnan, but that is tolerant of non-float types like: ``` Copy ``` Then you can use a set comprehension like this: ``` Copy ``` - [python](https://stackoverflow.com/questions/tagged/python "show questions tagged 'python'") [Share](https://stackoverflow.com/q/37147735 "Short permalink to this question") Share a link to this question Copy link [CC BY-SA 3.0](https://creativecommons.org/licenses/by-sa/3.0/ "The current license for this post: CC BY-SA 3.0") [Improve this question](https://stackoverflow.com/posts/37147735/edit) Follow Follow this question to receive notifications asked May 10, 2016 at 19:52 [![Brad Campbell's user avatar](https://i.sstatic.net/k7x3R.png?s=64)](https://stackoverflow.com/users/1231055/brad-campbell) [Brad Campbell](https://stackoverflow.com/users/1231055/brad-campbell) 3,11122 gold badges2525 silver badges2525 bronze badges 6 - 1 Putting NaNs in a set in the first place is a bad idea. They violate the assumptions a set is built upon. user2357112 – [user2357112](https://stackoverflow.com/users/2357112/user2357112 "286,393 reputation") 2016-05-10 19:56:36 +00:00 [Commented May 10, 2016 at 19:56](https://stackoverflow.com/questions/37147735/remove-nan-value-from-a-set#comment61833556_37147735) - What is the question? Valentin Lorentz – [Valentin Lorentz](https://stackoverflow.com/users/539465/valentin-lorentz "9,782 reputation") 2016-05-10 20:25:45 +00:00 [Commented May 10, 2016 at 20:25](https://stackoverflow.com/questions/37147735/remove-nan-value-from-a-set#comment61834501_37147735) - @ValentinLorentz Maybe the sentence that ends with a question mark? Stefan Pochmann – [Stefan Pochmann](https://stackoverflow.com/users/1672429/stefan-pochmann "29,019 reputation") 2016-05-10 20:27:10 +00:00 [Commented May 10, 2016 at 20:27](https://stackoverflow.com/questions/37147735/remove-nan-value-from-a-set#comment61834544_37147735) - @StefanPochmann It is answered at the end of the post Valentin Lorentz – [Valentin Lorentz](https://stackoverflow.com/users/539465/valentin-lorentz "9,782 reputation") 2016-05-10 20:29:00 +00:00 [Commented May 10, 2016 at 20:29](https://stackoverflow.com/questions/37147735/remove-nan-value-from-a-set#comment61834599_37147735) - 1 @user2357112 Yes, that was my conclusion. If you can't test something for equality, you can't really use them in sets. But, other than defining a function like in the question, I could not find another way to get them out of a set. Brad Campbell – [Brad Campbell](https://stackoverflow.com/users/1231055/brad-campbell "3,111 reputation") 2016-05-10 20:38:04 +00:00 [Commented May 10, 2016 at 20:38](https://stackoverflow.com/questions/37147735/remove-nan-value-from-a-set#comment61834904_37147735) \\| [Show 1 more comment](https://stackoverflow.com/questions/37147735/remove-nan-value-from-a-set "Expand to show all comments on this post") ## 5 Answers 5 Sorted by: [Reset to default](https://stackoverflow.com/questions/37147735/remove-nan-value-from-a-set?answertab=scoredesc#tab-top) This answer is useful 21 Save this answer. Show activity on this post. In practice, you could look at the fact that `nan != nan` as a feature, not a bug: ``` Copy ``` On the positive side, no need for a helper function. On the negative side, if you have a non-nan object which is also not equal to itself, you'll remove that too. [Share](https://stackoverflow.com/a/37148508 "Short permalink to this answer") Share a link to this answer Copy link [CC BY-SA 3.0](https://creativecommons.org/licenses/by-sa/3.0/ "The current license for this post: CC BY-SA 3.0") [Improve this answer](https://stackoverflow.com/posts/37148508/edit) Follow Follow this answer to receive notifications answered May 10, 2016 at 20:36 [![DSM's user avatar](https://i.sstatic.net/wbe4o.png?s=64)](https://stackoverflow.com/users/487339/dsm) [DSM](https://stackoverflow.com/users/487339/dsm) 355k6767 gold badges606606 silver badges504504 bronze badges Sign up to request clarification or add additional context in comments. ## 1 Comment Add a comment [![](https://i.sstatic.net/k7x3R.png?s=64)](https://stackoverflow.com/users/1231055/brad-campbell) Brad Campbell [Brad Campbell](https://stackoverflow.com/users/1231055/brad-campbell) [Over a year ago](https://stackoverflow.com/questions/37147735/remove-nan-value-from-a-set#comment61835098_37148508) I knew there had to be some way with resorting to the helper function. Thanks\! 2016-05-10T20:43:04.593Z+00:00 0 Reply - Copy link This answer is useful 8 Save this answer. Show activity on this post. Use [pd.notna()](https://pandas.pydata.org/docs/reference/api/pandas.notna.html#pandas.notna) from pandas, e.g.: ``` Copy ``` [Share](https://stackoverflow.com/a/53346628 "Short permalink to this answer") Share a link to this answer Copy link [CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/ "The current license for this post: CC BY-SA 4.0") [Improve this answer](https://stackoverflow.com/posts/53346628/edit) Follow Follow this answer to receive notifications [edited Oct 9, 2022 at 16:36](https://stackoverflow.com/posts/53346628/revisions "show all edits to this post") answered Nov 16, 2018 at 23:20 [![Pawel Kranzberg's user avatar](https://i.sstatic.net/CUWoq.png?s=64)](https://stackoverflow.com/users/3523176/pawel-kranzberg) [Pawel Kranzberg](https://stackoverflow.com/users/3523176/pawel-kranzberg) 1,3291616 silver badges1717 bronze badges ## Comments Add a comment This answer is useful 4 Save this answer. Show activity on this post. Also you can use `filter`: ``` Copy ``` [Share](https://stackoverflow.com/a/37148509 "Short permalink to this answer") Share a link to this answer Copy link [CC BY-SA 3.0](https://creativecommons.org/licenses/by-sa/3.0/ "The current license for this post: CC BY-SA 3.0") [Improve this answer](https://stackoverflow.com/posts/37148509/edit) Follow Follow this answer to receive notifications answered May 10, 2016 at 20:36 [![ej\_f's user avatar](https://i.sstatic.net/6I9kD.png?s=64)](https://stackoverflow.com/users/2635790/ej-f) [ej\_f](https://stackoverflow.com/users/2635790/ej-f) 46033 silver badges99 bronze badges ## Comments Add a comment This answer is useful 3 Save this answer. Show activity on this post. We can simply use the .remove() method ``` Copy ``` [Share](https://stackoverflow.com/a/64380141 "Short permalink to this answer") Share a link to this answer Copy link [CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/ "The current license for this post: CC BY-SA 4.0") [Improve this answer](https://stackoverflow.com/posts/64380141/edit) Follow Follow this answer to receive notifications [edited Oct 22, 2020 at 11:23](https://stackoverflow.com/posts/64380141/revisions "show all edits to this post") answered Oct 15, 2020 at 21:49 [![Benoît Lebreton's user avatar](https://lh4.googleusercontent.com/-jiaPjTM_z4g/AAAAAAAAAAI/AAAAAAAAAAA/AMZuucnsY6obpIKmaUdY2D7LyjZg19vevw/s96-c/s64-rj/photo.jpg)](https://stackoverflow.com/users/14459006/beno%C3%AEt-lebreton) [Benoît Lebreton](https://stackoverflow.com/users/14459006/beno%C3%AEt-lebreton) 4122 bronze badges ## 3 Comments Add a comment [![](https://i.sstatic.net/q4sxe.jpg?s=64)](https://stackoverflow.com/users/5604562/grayrigel) Grayrigel [Grayrigel](https://stackoverflow.com/users/5604562/grayrigel) [Over a year ago](https://stackoverflow.com/questions/37147735/remove-nan-value-from-a-set#comment113842952_64380141) Please consider add some explanation/comments to the code. 2020-10-15T22:47:25.62Z+00:00 1 Reply - Copy link [![](https://i.sstatic.net/CUWoq.png?s=64)](https://stackoverflow.com/users/3523176/pawel-kranzberg) Pawel Kranzberg [Pawel Kranzberg](https://stackoverflow.com/users/3523176/pawel-kranzberg) [Over a year ago](https://stackoverflow.com/questions/37147735/remove-nan-value-from-a-set#comment114958460_64380141) As @Fre\_der\_ik noted, `remove()` will raise an error if there is no NaN in the set. Use `discard()` instead. 2020-11-26T15:13:12.77Z+00:00 2 Reply - Copy link [![](https://i.sstatic.net/BOHgQ.png?s=64)](https://stackoverflow.com/users/11112772/md-sabbir-ahmed) Md Sabbir Ahmed [Md Sabbir Ahmed](https://stackoverflow.com/users/11112772/md-sabbir-ahmed) [Over a year ago](https://stackoverflow.com/questions/37147735/remove-nan-value-from-a-set#comment117007707_64380141) @Benoît Lebreton Your answer helped me a lot. 2021-02-13T07:33:12.087Z+00:00 0 Reply - Copy link Add a comment This answer is useful 0 Save this answer. Show activity on this post. I cannot make a comment, so I combine the answers above, with some explanation (for beginners). Create a set, including NaN (numpy.nan value) ``` Copy ``` Check the created set as result: ``` Copy ``` Discard (better then remove which could lead to KeyError if there is non NaN in the set) NaNs: ``` CopyIn[4]: a.discard(np.nan) ``` Check the result: ``` Copy ``` [Share](https://stackoverflow.com/a/76817869 "Short permalink to this answer") Share a link to this answer Copy link [CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/ "The current license for this post: CC BY-SA 4.0") [Improve this answer](https://stackoverflow.com/posts/76817869/edit) Follow Follow this answer to receive notifications answered Aug 2, 2023 at 8:14 [![QMCM's user avatar](https://lh3.googleusercontent.com/a/AATXAJzFBrVsqX4qyA9Bgp88xUZelZT4G0_iPnwtCrDK=k-s64)](https://stackoverflow.com/users/19204830/qmcm) [QMCM](https://stackoverflow.com/users/19204830/qmcm) 4144 bronze badges ## Comments Add a comment Start asking to get answers Find the answer to your question by asking. [Ask question](https://stackoverflow.com/questions/ask) Explore related questions - [python](https://stackoverflow.com/questions/tagged/python "show questions tagged 'python'") See similar questions with these tags. - The Overflow Blog - [If you're a Zoomer, this one's for you: Everything Gen Z needs to know about...](https://stackoverflow.blog/2026/01/14/gen-z-wrapped-2025/?cb=1 "If you're a Zoomer, this one's for you: Everything Gen Z needs to know about the 2025 tech landscape") - [How Stack Overflow is taking on spam and bad actors](https://stackoverflow.blog/2026/01/15/how-stack-overflow-is-taking-on-spam-and-bad-actors/?cb=1) - Featured on Meta - [A proposal for bringing back Community Promotion & Open Source Ads](https://meta.stackexchange.com/questions/416429/a-proposal-for-bringing-back-community-promotion-open-source-ads?cb=1) - [Community Asks Sprint Announcement – January 2026: Custom site-specific badges\!](https://meta.stackexchange.com/questions/416734/community-asks-sprint-announcement-january-2026-custom-site-specific-badges?cb=1) - [Policy: Generative AI (e.g., ChatGPT) is banned](https://meta.stackoverflow.com/questions/421831/policy-generative-ai-e-g-chatgpt-is-banned?cb=1) - [All users on Stack Overflow can now participate in chat](https://meta.stackoverflow.com/questions/437932/all-users-on-stack-overflow-can-now-participate-in-chat?cb=1) - [Should Stack Overflow utilize machine learning anti-spam?](https://meta.stackoverflow.com/questions/437959/should-stack-overflow-utilize-machine-learning-anti-spam?cb=1) Community activity Last 1 hr - Users online activity 4989 users online - 9 questions - 8 answers - 21 comments - 83 upvotes Popular tags [sql](https://stackoverflow.com/questions/tagged/sql)[mysql](https://stackoverflow.com/questions/tagged/mysql)[java](https://stackoverflow.com/questions/tagged/java)[python](https://stackoverflow.com/questions/tagged/python)[prisma](https://stackoverflow.com/questions/tagged/prisma) #### Linked [2](https://stackoverflow.com/questions/45978058/return-nan-from-indexing-operation-on-a-pandas-series?lq=1 "Question score (upvotes - downvotes)") [Return NaN from indexing operation on a pandas series](https://stackoverflow.com/questions/45978058/return-nan-from-indexing-operation-on-a-pandas-series?noredirect=1&lq=1) #### Related [5664](https://stackoverflow.com/questions/522563/how-can-i-access-the-index-value-in-a-for-loop?rq=1 "Question score (upvotes - downvotes)") [How can I access the index value in a 'for' loop?](https://stackoverflow.com/questions/522563/how-can-i-access-the-index-value-in-a-for-loop?rq=1) [3013](https://stackoverflow.com/questions/11277432/how-can-i-remove-a-key-from-a-python-dictionary?rq=1 "Question score (upvotes - downvotes)") [How can I remove a key from a Python dictionary?](https://stackoverflow.com/questions/11277432/how-can-i-remove-a-key-from-a-python-dictionary?rq=1) [3413](https://stackoverflow.com/questions/613183/how-do-i-sort-a-dictionary-by-value?rq=1 "Question score (upvotes - downvotes)") [How do I sort a dictionary by value?](https://stackoverflow.com/questions/613183/how-do-i-sort-a-dictionary-by-value?rq=1) [2345](https://stackoverflow.com/questions/627435/how-to-remove-an-element-from-a-list-by-index?rq=1 "Question score (upvotes - downvotes)") [How to remove an element from a list by index](https://stackoverflow.com/questions/627435/how-to-remove-an-element-from-a-list-by-index?rq=1) [1723](https://stackoverflow.com/questions/944700/how-to-check-for-nan-values?rq=1 "Question score (upvotes - downvotes)") [How to check for NaN values](https://stackoverflow.com/questions/944700/how-to-check-for-nan-values?rq=1) [3628](https://stackoverflow.com/questions/17071871/how-do-i-select-rows-from-a-dataframe-based-on-column-values?rq=1 "Question score (upvotes - downvotes)") [How do I select rows from a DataFrame based on column values?](https://stackoverflow.com/questions/17071871/how-do-i-select-rows-from-a-dataframe-based-on-column-values?rq=1) [2077](https://stackoverflow.com/questions/275018/how-can-i-remove-a-trailing-newline?rq=1 "Question score (upvotes - downvotes)") [How can I remove a trailing newline?](https://stackoverflow.com/questions/275018/how-can-i-remove-a-trailing-newline?rq=1) [2663](https://stackoverflow.com/questions/4383571/importing-files-from-different-folder?rq=1 "Question score (upvotes - downvotes)") [Importing files from different folder](https://stackoverflow.com/questions/4383571/importing-files-from-different-folder?rq=1) [1477](https://stackoverflow.com/questions/13413590/how-to-drop-rows-of-pandas-dataframe-whose-value-in-a-certain-column-is-nan?rq=1 "Question score (upvotes - downvotes)") [How to drop rows of Pandas DataFrame whose value in a certain column is NaN](https://stackoverflow.com/questions/13413590/how-to-drop-rows-of-pandas-dataframe-whose-value-in-a-certain-column-is-nan?rq=1) #### [Hot Network Questions](https://stackexchange.com/questions?tab=hot) - [Are achievements bugged in Sludge Life 2?](https://gaming.stackexchange.com/questions/417620/are-achievements-bugged-in-sludge-life-2) - [Can I pigtail \#14/2 wire off \#8/3 gauge to run 3 receptacles?](https://diy.stackexchange.com/questions/328613/can-i-pigtail-14-2-wire-off-8-3-gauge-to-run-3-receptacles) - [How is the recursion principle for Acc generated by Rocq?](https://proofassistants.stackexchange.com/questions/6447/how-is-the-recursion-principle-for-acc-generated-by-rocq) - [Do 40% of Australian teenage boys support “right-wing violent extremism”?](https://skeptics.stackexchange.com/questions/60427/do-40-of-australian-teenage-boys-support-right-wing-violent-extremism) - [English idiom about a new item breaking down or getting lost upon acquisition](https://english.stackexchange.com/questions/638603/english-idiom-about-a-new-item-breaking-down-or-getting-lost-upon-acquisition) - [Could reality exist without logic? Could reality be illogical?](https://philosophy.stackexchange.com/questions/135280/could-reality-exist-without-logic-could-reality-be-illogical) - [Bending Paper with IK Bones](https://blender.stackexchange.com/questions/344524/bending-paper-with-ik-bones) - [How to define file-based indentation rules in Kate?](https://unix.stackexchange.com/questions/803767/how-to-define-file-based-indentation-rules-in-kate) - [Strong Linear Correlation but Highly Patterned Residuals](https://stats.stackexchange.com/questions/674341/strong-linear-correlation-but-highly-patterned-residuals) - [78xx adjustable voltage circuit not working](https://electronics.stackexchange.com/questions/764456/78xx-adjustable-voltage-circuit-not-working) - [Another definite integral](https://mathoverflow.net/questions/507034/another-definite-integral) - [Does GPL require code-sharing to be specific to the product, or can a company lump all GPL software in one non-specific place?](https://opensource.stackexchange.com/questions/15694/does-gpl-require-code-sharing-to-be-specific-to-the-product-or-can-a-company-lu) - [Why adding titlesec makes links in toc inside PDF no longer work when using \\setcounter{secnumdepth}{0}?](https://tex.stackexchange.com/questions/758333/why-adding-titlesec-makes-links-in-toc-inside-pdf-no-longer-work-when-using-set) - [Hierarchical lists in ConTeXt?](https://tex.stackexchange.com/questions/758336/hierarchical-lists-in-context) - [Periodic Updates for User Control Types (E.g. DataGrid/TextBoxes/etc) from DB in WPF with MVVM pattern?](https://softwareengineering.stackexchange.com/questions/460710/periodic-updates-for-user-control-types-e-g-datagrid-textboxes-etc-from-db-in) - [Files with identical name in the same directory](https://unix.stackexchange.com/questions/803744/files-with-identical-name-in-the-same-directory) - [Is working on and publishing "grunt math" acceptable as a high school student?](https://academia.stackexchange.com/questions/225638/is-working-on-and-publishing-grunt-math-acceptable-as-a-high-school-student) - [Origin of “sch” in German writing](https://german.stackexchange.com/questions/82038/origin-of-sch-in-german-writing) - [What is "social freedom"?](https://politics.stackexchange.com/questions/94073/what-is-social-freedom) - [Why was Gold 5 apparently giving orders to Gold Leader during the first trench run?](https://scifi.stackexchange.com/questions/302848/why-was-gold-5-apparently-giving-orders-to-gold-leader-during-the-first-trench-r) - [Interpreting それへの妥当性](https://japanese.stackexchange.com/questions/111664/interpreting-%E3%81%9D%E3%82%8C%E3%81%B8%E3%81%AE%E5%A6%A5%E5%BD%93%E6%80%A7) - [Long term side effect of cryosleep](https://worldbuilding.stackexchange.com/questions/272347/long-term-side-effect-of-cryosleep) - [What is "interception" of transactions in the BTCPuzzle case?](https://bitcoin.stackexchange.com/questions/130427/what-is-interception-of-transactions-in-the-btcpuzzle-case) - [How Should I Write a Series of Thoughts being Interrupted?](https://writing.stackexchange.com/questions/72129/how-should-i-write-a-series-of-thoughts-being-interrupted) [Question feed](https://stackoverflow.com/feeds/question/37147735 "Feed of this question and its answers") # Subscribe to RSS Question feed To subscribe to this RSS feed, copy and paste this URL into your RSS reader. ![](https://stackoverflow.com/posts/37147735/ivc/81c6?prg=c72006dd-7b7f-47dc-b887-7e48bb86cafa) lang-py # Why are you flagging this comment? Probable spam. This comment promotes a product, service or website while [failing to disclose the author's affiliation](https://stackoverflow.com/help/promotion). Unfriendly or contains harassment/bigotry/abuse. This comment is unkind, insulting or attacks another person or group. Learn more in our [Abusive behavior policy](https://stackoverflow.com/conduct/abusive-behavior). Not needed. This comment is not relevant to the post. ``` ``` Enter at least 6 characters Something else. A problem not listed above. Try to be as specific as possible. ``` ``` Enter at least 6 characters Flag comment Cancel You have 0 flags left today # ![Illustration of upvote icon after it is clicked](https://stackoverflow.com/Content/Img/modal/img-upvote.png?v=fce73bd9724d) # Hang on, you can't upvote just yet. You'll need to complete a few actions and gain 15 reputation points before being able to upvote. Upvoting indicates when questions and answers are useful. [What's reputation and how do I get it?](https://stackoverflow.com/help/whats-reputation) Instead, you can save this post to reference later. Save this post for later Not now ##### [Stack Overflow](https://stackoverflow.com/) - [Questions](https://stackoverflow.com/questions) - [Help](https://stackoverflow.com/help) - [Chat](https://chat.stackoverflow.com/?tab=explore) ##### [Business](https://stackoverflow.co/) - [Stack Internal](https://stackoverflow.co/internal/?utm_medium=referral&utm_source=stackoverflow-community&utm_campaign=footer&utm_content=teams) - [Stack Data Licensing](https://stackoverflow.co/data-licensing/?utm_medium=referral&utm_source=stackoverflow-community&utm_campaign=footer&utm_content=data-licensing) - [Stack Ads](https://stackoverflow.co/advertising/?utm_medium=referral&utm_source=stackoverflow-community&utm_campaign=footer&utm_content=advertising) ##### [Company](https://stackoverflow.co/) - [About](https://stackoverflow.co/) - [Press](https://stackoverflow.co/company/press/) - [Work Here](https://stackoverflow.co/company/work-here/) - [Legal](https://stackoverflow.com/legal) - [Privacy Policy](https://stackoverflow.com/legal/privacy-policy) - [Terms of Service](https://stackoverflow.com/legal/terms-of-service/public) - [Contact Us](https://stackoverflow.com/contact) - Cookie Settings - [Cookie Policy](https://policies.stackoverflow.co/stack-overflow/cookie-policy) ##### [Stack Exchange Network](https://stackexchange.com/) - [Technology](https://stackexchange.com/sites#technology) - [Culture & recreation](https://stackexchange.com/sites#culturerecreation) - [Life & arts](https://stackexchange.com/sites#lifearts) - [Science](https://stackexchange.com/sites#science) - [Professional](https://stackexchange.com/sites#professional) - [Business](https://stackexchange.com/sites#business) - [API](https://api.stackexchange.com/) - [Data](https://data.stackexchange.com/) - [Blog](https://stackoverflow.blog/?blb=1) - [Facebook](https://www.facebook.com/officialstackoverflow/) - [Twitter](https://twitter.com/stackoverflow) - [LinkedIn](https://linkedin.com/company/stack-overflow) - [Instagram](https://www.instagram.com/thestackoverflow) Site design / logo © 2026 Stack Exchange Inc; user contributions licensed under [CC BY-SA](https://stackoverflow.com/help/licensing) . rev 2026.1.14.38635
Readable Markdown	null
Shard	169 (laksa)
Root Hash	714406497480128969
Unparsed URL	com,stackoverflow!/questions/37147735/remove-nan-value-from-a-set s443