{"id":222732,"date":"2025-04-07T13:16:44","date_gmt":"2025-04-07T13:16:44","guid":{"rendered":"https:\/\/namso-gen.co\/blog\/does-python-pass-by-reference-or-value\/"},"modified":"2025-04-07T13:16:44","modified_gmt":"2025-04-07T13:16:44","slug":"does-python-pass-by-reference-or-value","status":"publish","type":"post","link":"https:\/\/namso-gen.co\/blog\/does-python-pass-by-reference-or-value\/","title":{"rendered":"Does Python pass by reference or value?"},"content":{"rendered":"<p><\/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-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/namso-gen.co\/blog\/does-python-pass-by-reference-or-value\/#Introduction\" title=\"Introduction\">Introduction<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/namso-gen.co\/blog\/does-python-pass-by-reference-or-value\/#The_Answer_Python_passes_by_reference\" title=\"The Answer: Python passes by reference\">The Answer: Python passes by reference<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/namso-gen.co\/blog\/does-python-pass-by-reference-or-value\/#Frequently_Asked_Questions\" title=\"Frequently Asked Questions\">Frequently Asked Questions<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/namso-gen.co\/blog\/does-python-pass-by-reference-or-value\/#1_What_is_pass_by_reference\" title=\"1. What is pass by reference?\">1. What is pass by reference?<\/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\/does-python-pass-by-reference-or-value\/#2_Can_I_change_the_original_object_within_a_function\" title=\"2. Can I change the original object within a function?\">2. Can I change the original object within a function?<\/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\/does-python-pass-by-reference-or-value\/#3_Are_primitive_types_passed_by_reference_too\" title=\"3. Are primitive types passed by reference too?\">3. Are primitive types passed by reference too?<\/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\/does-python-pass-by-reference-or-value\/#4_What_about_mutable_objects\" title=\"4. What about mutable objects?\">4. What about mutable objects?<\/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\/does-python-pass-by-reference-or-value\/#5_Can_I_create_a_copy_of_an_object_to_avoid_modifying_the_original\" title=\"5. Can I create a copy of an object to avoid modifying the original?\">5. Can I create a copy of an object to avoid modifying the original?<\/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\/does-python-pass-by-reference-or-value\/#6_Are_there_any_exceptions_to_passing_by_reference\" title=\"6. Are there any exceptions to passing by reference?\">6. Are there any exceptions to passing by reference?<\/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\/does-python-pass-by-reference-or-value\/#7_How_does_passing_by_reference_affect_memory_usage\" title=\"7. How does passing by reference affect memory usage?\">7. How does passing by reference affect memory usage?<\/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\/does-python-pass-by-reference-or-value\/#8_Are_there_any_downsides_to_passing_by_reference\" title=\"8. Are there any downsides to passing by reference?\">8. Are there any downsides to passing by reference?<\/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\/does-python-pass-by-reference-or-value\/#9_Can_I_force_pass_by_value_behavior_in_Python\" title=\"9. Can I force pass by value behavior in Python?\">9. Can I force pass by value behavior 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\/does-python-pass-by-reference-or-value\/#10_Can_I_assign_a_new_value_to_a_reference_within_a_function\" title=\"10. Can I assign a new value to a reference within a function?\">10. Can I assign a new value to a reference within a function?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/namso-gen.co\/blog\/does-python-pass-by-reference-or-value\/#11_Are_function_return_values_affected_by_pass_by_reference\" title=\"11. Are function return values affected by pass by reference?\">11. Are function return values affected by pass by reference?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/namso-gen.co\/blog\/does-python-pass-by-reference-or-value\/#12_How_can_I_pass_an_object_by_value_instead_of_reference\" title=\"12. How can I pass an object by value instead of reference?\">12. How can I pass an object by value instead of reference?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/namso-gen.co\/blog\/does-python-pass-by-reference-or-value\/#Conclusion\" title=\"Conclusion\">Conclusion<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Introduction\"><\/span>Introduction<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\nPython is a versatile and powerful programming language used extensively for various purposes. One question that often arises among Python developers is whether Python passes arguments to functions by reference or by value. This article aims to clarify this topic and provide a clear answer to the question: Does Python pass by reference or value?<\/p>\n<h2><span class=\"ez-toc-section\" id=\"The_Answer_Python_passes_by_reference\"><\/span>The Answer: Python passes by reference<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\n<b>Yes, Python passes arguments to functions by reference.<\/b> This means that when we pass an object as an argument to a function, the function receives a reference to the object, not a copy of it. Any changes made to the object within the function will affect the original object in the calling code.<\/p>\n<p>This behavior might be different from some other programming languages, which pass arguments by value. However, in Python, the reference to the object is passed, allowing the function to operate directly on the original object.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Frequently_Asked_Questions\"><\/span>Frequently Asked Questions<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"1_What_is_pass_by_reference\"><\/span>1. What is pass by reference?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nPass by reference means that the actual memory address of the variable is passed to the function, allowing modifications to be made directly to the original object.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"2_Can_I_change_the_original_object_within_a_function\"><\/span>2. Can I change the original object within a function?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nYes, since Python passes arguments by reference, any modifications made to the object within a function will affect the original object outside the function.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"3_Are_primitive_types_passed_by_reference_too\"><\/span>3. Are primitive types passed by reference too?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nNo, primitive types such as integers or strings are immutable in Python. When passed to a function, a new copy is created, and any changes made within the function will not affect the original object.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"4_What_about_mutable_objects\"><\/span>4. What about mutable objects?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nMutable objects, such as lists or dictionaries, are passed by reference. Changes made to these objects within a function will be reflected in the original object.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"5_Can_I_create_a_copy_of_an_object_to_avoid_modifying_the_original\"><\/span>5. Can I create a copy of an object to avoid modifying the original?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nYes, you can create a copy of an object using the appropriate method or a copy constructor. This way, you can manipulate the copy without affecting the original object.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"6_Are_there_any_exceptions_to_passing_by_reference\"><\/span>6. Are there any exceptions to passing by reference?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nNo, all objects, including user-defined objects, are passed by reference in Python.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"7_How_does_passing_by_reference_affect_memory_usage\"><\/span>7. How does passing by reference affect memory usage?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nSince objects are passed by reference, memory usage can be efficient, especially when dealing with large data structures or complex objects.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"8_Are_there_any_downsides_to_passing_by_reference\"><\/span>8. Are there any downsides to passing by reference?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nOne downside is that modifications made within a function can have unintended side effects outside the function, leading to hard-to-debug issues if not carefully managed.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"9_Can_I_force_pass_by_value_behavior_in_Python\"><\/span>9. Can I force pass by value behavior in Python?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nNo, by default, Python passes objects by reference. There is no built-in mechanism to force pass by value behavior, like in some other programming languages.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"10_Can_I_assign_a_new_value_to_a_reference_within_a_function\"><\/span>10. Can I assign a new value to a reference within a function?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nYes, you can assign a new value to a reference within a function, but it will only affect the local scope of the function and will not modify the original object outside the function.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"11_Are_function_return_values_affected_by_pass_by_reference\"><\/span>11. Are function return values affected by pass by reference?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nNo, function return values are not affected by pass by reference. The return value is a completely new object and does not alter the original object passed to the function.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"12_How_can_I_pass_an_object_by_value_instead_of_reference\"><\/span>12. How can I pass an object by value instead of reference?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nTo pass an object by value, you can create a copy of it and pass the copy as an argument to the function. This ensures that any changes made within the function will only affect the copy, leaving the original object unchanged.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\nIn conclusion, Python passes arguments to functions by reference. This behavior allows for efficient memory usage and enables modifications to the original object within a function. Understanding pass by reference is crucial when working with complex data structures and objects in Python. Remember to handle modifications carefully to avoid unintended side effects.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Introduction Python is a versatile and powerful programming language used extensively for various purposes. One question that often arises among Python developers is whether Python passes arguments to functions by reference or by value. This article aims to clarify this topic and provide a clear answer to the question: Does Python pass by reference or &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"Does Python pass by reference or value?\" class=\"read-more button\" href=\"https:\/\/namso-gen.co\/blog\/does-python-pass-by-reference-or-value\/#more-222732\">Read more<span class=\"screen-reader-text\">Does Python pass by reference or value?<\/span><\/a><\/p>\n","protected":false},"author":56,"featured_media":107420,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86279],"tags":[],"class_list":["post-222732","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>Does Python pass by reference or value?<\/title>\n<meta name=\"description\" content=\"Introduction Python is a versatile and powerful programming language used extensively for various purposes. 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