{"id":211369,"date":"2025-05-23T01:13:18","date_gmt":"2025-05-23T01:13:18","guid":{"rendered":"https:\/\/namso-gen.co\/blog\/are-functions-in-python-passed-by-reference-or-value\/"},"modified":"2025-05-23T01:13:18","modified_gmt":"2025-05-23T01:13:18","slug":"are-functions-in-python-passed-by-reference-or-value","status":"publish","type":"post","link":"https:\/\/namso-gen.co\/blog\/are-functions-in-python-passed-by-reference-or-value\/","title":{"rendered":"Are functions in Python passed by reference or value?"},"content":{"rendered":"<p>\nThe answer is: **In Python, functions are passed by reference.**<\/p>\n<p>When passing arguments to functions in Python, a reference to the object is passed, not the actual object itself. This means that changes made to the object within the function will affect the object outside of the function as well.<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_62 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title \" >Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/namso-gen.co\/blog\/are-functions-in-python-passed-by-reference-or-value\/#FAQs_about_passing_arguments_in_Python_functions\" title=\"FAQs about passing arguments in Python functions:\">FAQs about passing arguments in Python functions:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/namso-gen.co\/blog\/are-functions-in-python-passed-by-reference-or-value\/#1_What_does_it_mean_to_pass_by_reference_in_Python\" title=\"1. What does it mean to pass by reference in Python?\">1. What does it mean to pass by reference in Python?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/namso-gen.co\/blog\/are-functions-in-python-passed-by-reference-or-value\/#2_Can_I_pass_integers_by_reference_in_Python\" title=\"2. Can I pass integers by reference in Python?\">2. Can I pass integers by reference in Python?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/namso-gen.co\/blog\/are-functions-in-python-passed-by-reference-or-value\/#3_Are_lists_passed_by_reference_in_Python\" title=\"3. Are lists passed by reference in Python?\">3. Are lists passed by reference in Python?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/namso-gen.co\/blog\/are-functions-in-python-passed-by-reference-or-value\/#4_How_can_I_pass_by_value_in_Python\" title=\"4. How can I pass by value in Python?\">4. How can I pass by value in Python?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/namso-gen.co\/blog\/are-functions-in-python-passed-by-reference-or-value\/#5_What_happens_if_I_modify_a_parameter_passed_by_reference_in_Python\" title=\"5. What happens if I modify a parameter passed by reference in Python?\">5. What happens if I modify a parameter passed by reference in Python?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/namso-gen.co\/blog\/are-functions-in-python-passed-by-reference-or-value\/#6_Can_I_pass_strings_by_reference_in_Python\" title=\"6. Can I pass strings by reference in Python?\">6. Can I pass strings by reference in Python?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/namso-gen.co\/blog\/are-functions-in-python-passed-by-reference-or-value\/#7_Are_dictionaries_passed_by_reference_in_Python\" title=\"7. Are dictionaries passed by reference in Python?\">7. Are dictionaries passed by reference in Python?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/namso-gen.co\/blog\/are-functions-in-python-passed-by-reference-or-value\/#8_What_is_the_difference_between_passing_by_reference_and_passing_by_value_in_Python\" title=\"8. What is the difference between passing by reference and passing by value in Python?\">8. What is the difference between passing by reference and passing by value in Python?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/namso-gen.co\/blog\/are-functions-in-python-passed-by-reference-or-value\/#9_How_does_passing_by_reference_affect_memory_usage_in_Python\" title=\"9. How does passing by reference affect memory usage in Python?\">9. How does passing by reference affect memory usage in Python?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/namso-gen.co\/blog\/are-functions-in-python-passed-by-reference-or-value\/#10_Can_I_pass_custom_objects_by_reference_in_Python\" title=\"10. Can I pass custom objects by reference in Python?\">10. Can I pass custom objects by reference in Python?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/namso-gen.co\/blog\/are-functions-in-python-passed-by-reference-or-value\/#11_Are_tuples_passed_by_reference_in_Python\" title=\"11. Are tuples passed by reference in Python?\">11. Are tuples passed by reference in Python?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/namso-gen.co\/blog\/are-functions-in-python-passed-by-reference-or-value\/#12_How_can_I_avoid_unintended_side_effects_when_passing_by_reference_in_Python\" title=\"12. How can I avoid unintended side effects when passing by reference in Python?\">12. How can I avoid unintended side effects when passing by reference in Python?<\/a><\/li><\/ul><\/nav><\/div>\n<h3><span class=\"ez-toc-section\" id=\"FAQs_about_passing_arguments_in_Python_functions\"><\/span>FAQs about passing arguments in Python functions:<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<h3><span class=\"ez-toc-section\" id=\"1_What_does_it_mean_to_pass_by_reference_in_Python\"><\/span>1. What does it mean to pass by reference in Python?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nPassing by reference in Python means that when an argument is passed to a function, a reference to the original object is passed, allowing changes made to the object within the function to affect the object outside of the function.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"2_Can_I_pass_integers_by_reference_in_Python\"><\/span>2. Can I pass integers by reference in Python?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nNo, integers in Python are immutable, which means that when you pass an integer to a function, a copy of the value is passed, not a reference to the original object.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"3_Are_lists_passed_by_reference_in_Python\"><\/span>3. Are lists passed by reference in Python?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nYes, lists in Python are mutable, so when you pass a list to a function, a reference to the original list is passed, allowing changes made to the list within the function to affect the list outside of the function.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"4_How_can_I_pass_by_value_in_Python\"><\/span>4. How can I pass by value in Python?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nIf you want to pass by value in Python, you can make a copy of the object before passing it to the function. This way, changes made to the object within the function will not affect the original object.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"5_What_happens_if_I_modify_a_parameter_passed_by_reference_in_Python\"><\/span>5. What happens if I modify a parameter passed by reference in Python?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nIf you modify a parameter passed by reference in a Python function, the changes will be reflected in the original object outside of the function as well.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"6_Can_I_pass_strings_by_reference_in_Python\"><\/span>6. Can I pass strings by reference in Python?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nYes, strings in Python are immutable, but they are still passed by reference. However, since strings cannot be modified in place, any changes made to a string within a function will create a new string object.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"7_Are_dictionaries_passed_by_reference_in_Python\"><\/span>7. Are dictionaries passed by reference in Python?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nYes, dictionaries in Python are mutable, so when you pass a dictionary to a function, a reference to the original dictionary is passed, allowing changes made to the dictionary within the function to affect the dictionary outside of the function.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"8_What_is_the_difference_between_passing_by_reference_and_passing_by_value_in_Python\"><\/span>8. What is the difference between passing by reference and passing by value in Python?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nWhen passing by reference in Python, changes made to the object within the function affect the original object outside of the function. When passing by value, changes made to the object within the function do not affect the original object.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"9_How_does_passing_by_reference_affect_memory_usage_in_Python\"><\/span>9. How does passing by reference affect memory usage in Python?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nPassing by reference in Python can lead to memory efficiency, as only references to objects are passed, rather than making copies of the objects. This can result in faster execution of functions.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"10_Can_I_pass_custom_objects_by_reference_in_Python\"><\/span>10. Can I pass custom objects by reference in Python?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nYes, custom objects in Python are passed by reference, just like built-in objects. Any changes made to a custom object within a function will be reflected in the original object outside of the function.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"11_Are_tuples_passed_by_reference_in_Python\"><\/span>11. Are tuples passed by reference in Python?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nTuples in Python are immutable, so when you pass a tuple to a function, a copy of the tuple is passed, not a reference to the original tuple object.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"12_How_can_I_avoid_unintended_side_effects_when_passing_by_reference_in_Python\"><\/span>12. How can I avoid unintended side effects when passing by reference in Python?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nTo avoid unintended side effects when passing by reference in Python, you can make a copy of the object before modifying it within the function. This way, the original object remains unchanged, and the function operates on a separate copy.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The answer is: **In Python, functions are passed by reference.** When passing arguments to functions in Python, a reference to the object is passed, not the actual object itself. This means that changes made to the object within the function will affect the object outside of the function as well. FAQs about passing arguments in &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"Are functions in Python passed by reference or value?\" class=\"read-more button\" href=\"https:\/\/namso-gen.co\/blog\/are-functions-in-python-passed-by-reference-or-value\/#more-211369\">Read more<span class=\"screen-reader-text\">Are functions in Python passed by reference or value?<\/span><\/a><\/p>\n","protected":false},"author":53,"featured_media":107420,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86279],"tags":[],"class_list":["post-211369","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-learn","no-featured-image-padding"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Are functions in Python passed by reference or value?<\/title>\n<meta name=\"description\" content=\"The answer is: **In Python, functions are passed by reference.** When passing arguments to functions in Python, a reference to the object is passed, not\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/namso-gen.co\/blog\/are-functions-in-python-passed-by-reference-or-value\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Are functions in Python passed by reference or value?\" \/>\n<meta property=\"og:description\" content=\"The answer is: **In Python, functions are passed by reference.** When passing arguments to functions in Python, a reference to the object is passed, not\" \/>\n<meta property=\"og:url\" content=\"https:\/\/namso-gen.co\/blog\/are-functions-in-python-passed-by-reference-or-value\/\" \/>\n<meta property=\"og:site_name\" content=\"Namso Gen Blog - 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