{"id":222737,"date":"2024-10-08T05:28:15","date_gmt":"2024-10-08T05:28:15","guid":{"rendered":"https:\/\/namso-gen.co\/blog\/does-python-pass-by-value-or-reference\/"},"modified":"2024-10-08T05:28:15","modified_gmt":"2024-10-08T05:28:15","slug":"does-python-pass-by-value-or-reference","status":"publish","type":"post","link":"https:\/\/namso-gen.co\/blog\/does-python-pass-by-value-or-reference\/","title":{"rendered":"Does Python pass by value or reference?"},"content":{"rendered":"<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-value-or-reference\/#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-value-or-reference\/#Pythons_approach_to_passing_variables\" title=\"Python&#8217;s approach to passing variables\">Python&#8217;s approach to passing variables<\/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-value-or-reference\/#The_answer_to_the_question_Does_Python_pass_by_value_or_reference\" title=\"The answer to the question: Does Python pass by value or reference?\">The answer to the question: Does Python pass by value or reference?<\/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-value-or-reference\/#FAQs\" title=\"FAQs:\">FAQs:<\/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-value-or-reference\/#1_What_is_%E2%80%9Cpassing_by_assignment%E2%80%9D\" title=\"1. What is &#8220;passing by assignment&#8221;?\">1. What is &#8220;passing by assignment&#8221;?<\/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-value-or-reference\/#2_How_does_%E2%80%9Cpassing_by_assignment%E2%80%9D_work\" title=\"2. How does &#8220;passing by assignment&#8221; work?\">2. How does &#8220;passing by assignment&#8221; work?<\/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-value-or-reference\/#3_Does_everything_in_Python_pass_by_value\" title=\"3. Does everything in Python pass by value?\">3. Does everything in Python pass by value?<\/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-value-or-reference\/#4_Can_we_change_the_value_of_a_variable_from_within_a_function\" title=\"4. Can we change the value of a variable from within a function?\">4. Can we change the value of a variable from within a function?<\/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-value-or-reference\/#5_What_happens_when_we_pass_an_immutable_variable_to_a_function\" title=\"5. What happens when we pass an immutable variable to a function?\">5. What happens when we pass an immutable variable to a function?<\/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-value-or-reference\/#6_Are_integers_mutable_or_immutable_in_Python\" title=\"6. Are integers mutable or immutable in Python?\">6. Are integers mutable or immutable 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\/does-python-pass-by-value-or-reference\/#7_How_can_we_modify_an_immutable_variable_within_a_function\" title=\"7. How can we modify an immutable variable within a function?\">7. How can we modify an immutable variable within a function?<\/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-value-or-reference\/#8_Does_changing_a_function_parameter_affect_the_original_variable\" title=\"8. Does changing a function parameter affect the original variable?\">8. Does changing a function parameter affect the original variable?<\/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-value-or-reference\/#9_Can_we_force_Python_to_pass_variables_by_reference\" title=\"9. Can we force Python to pass variables by reference?\">9. Can we force Python to pass variables by reference?<\/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-value-or-reference\/#10_Does_%E2%80%9Cpassing_by_value%E2%80%9D_mean_that_a_copy_of_the_variable_is_made\" title=\"10. Does &#8220;passing by value&#8221; mean that a copy of the variable is made?\">10. Does &#8220;passing by value&#8221; mean that a copy of the variable is made?<\/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-value-or-reference\/#11_Can_we_pass_a_variable_by_reference_in_Python\" title=\"11. Can we pass a variable by reference in Python?\">11. Can we pass a variable 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-16\" href=\"https:\/\/namso-gen.co\/blog\/does-python-pass-by-value-or-reference\/#12_Can_we_change_the_reference_an_object_points_to_within_a_function\" title=\"12. Can we change the reference an object points to within a function?\">12. Can we change the reference an object points to within a function?<\/a><\/li><\/ul><\/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>\nOne of the fundamental concepts in Python programming is how function arguments are passed and how values are assigned to variables. Understanding whether Python passes variables by value or by reference is crucial for writing efficient and bug-free code.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Pythons_approach_to_passing_variables\"><\/span>Python&#8217;s approach to passing variables<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\nPython uses a unique approach to passing variables, which may differ from other programming languages. In Python, variables are neither strictly passed by value nor by reference, but rather through a mechanism called &#8220;passing by assignment.&#8221; To fully grasp this concept, let&#8217;s delve deeper into the details.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"The_answer_to_the_question_Does_Python_pass_by_value_or_reference\"><\/span>The answer to the question: Does Python pass by value or reference?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\n**Python passes variables by value.** This means that when a function is called, the value of the variable is passed to the function&#8217;s parameter, and any changes made to the parameter within the function will not affect the original variable.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"FAQs\"><\/span>FAQs:<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<h3><span class=\"ez-toc-section\" id=\"1_What_is_%E2%80%9Cpassing_by_assignment%E2%80%9D\"><\/span>1. What is &#8220;passing by assignment&#8221;?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\n&#8220;Passing by assignment&#8221; means that when a function is called, the value of the object (a variable, for example) is bound to the function&#8217;s parameter name.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"2_How_does_%E2%80%9Cpassing_by_assignment%E2%80%9D_work\"><\/span>2. How does &#8220;passing by assignment&#8221; work?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nIn Python, variables are references to objects rather than containers for values. When a variable is assigned a value, it is bound to the object containing that value.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"3_Does_everything_in_Python_pass_by_value\"><\/span>3. Does everything in Python pass by value?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nYes, everything in Python passes by value. However, the subtlety lies in understanding that when we pass the value of a variable to a function, we are passing the value of the reference.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"4_Can_we_change_the_value_of_a_variable_from_within_a_function\"><\/span>4. Can we change the value of a variable from within a function?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nYes, we can change the value of a mutable variable (such as a list or dictionary) from within a function, but it does not affect the original variable outside the function.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"5_What_happens_when_we_pass_an_immutable_variable_to_a_function\"><\/span>5. What happens when we pass an immutable variable to a function?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nWhen an immutable variable (such as a string or tuple) is passed to a function, any changes made to the parameter within the function will not affect the original variable.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"6_Are_integers_mutable_or_immutable_in_Python\"><\/span>6. Are integers mutable or immutable in Python?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nIntegers are immutable in Python. You cannot change the value of an integer; you can only create a new integer object and assign it to a variable.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"7_How_can_we_modify_an_immutable_variable_within_a_function\"><\/span>7. How can we modify an immutable variable within a function?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nTo modify an immutable variable within a function, you can create a new object and return it. The original variable can then be reassigned to the new object.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"8_Does_changing_a_function_parameter_affect_the_original_variable\"><\/span>8. Does changing a function parameter affect the original variable?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nChanging the value of a function parameter within the function does not affect the original variable outside the function. This holds true regardless of whether the variable is mutable or immutable.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"9_Can_we_force_Python_to_pass_variables_by_reference\"><\/span>9. Can we force Python to pass variables by reference?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nNo, it is not possible to force Python to pass variables by reference instead of by value. However, you can achieve a similar effect by passing mutable objects and modifying them within the function.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"10_Does_%E2%80%9Cpassing_by_value%E2%80%9D_mean_that_a_copy_of_the_variable_is_made\"><\/span>10. Does &#8220;passing by value&#8221; mean that a copy of the variable is made?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nNo, &#8220;passing by value&#8221; does not mean that a copy of the variable is made. Instead, the reference to the object is passed. However, any changes made to the reference within the function will not affect the original variable.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"11_Can_we_pass_a_variable_by_reference_in_Python\"><\/span>11. Can we pass a variable by reference in Python?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nNo, Python does not directly support passing variables by reference. However, you can pass mutable objects to a function and modify them within the function, achieving a similar effect.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"12_Can_we_change_the_reference_an_object_points_to_within_a_function\"><\/span>12. Can we change the reference an object points to within a function?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\nNo, changing the reference an object points to within a function will not affect the original variable outside the function, as variables are local to the function scope.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Introduction One of the fundamental concepts in Python programming is how function arguments are passed and how values are assigned to variables. Understanding whether Python passes variables by value or by reference is crucial for writing efficient and bug-free code. Python&#8217;s approach to passing variables Python uses a unique approach to passing variables, which may &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"Does Python pass by value or reference?\" class=\"read-more button\" href=\"https:\/\/namso-gen.co\/blog\/does-python-pass-by-value-or-reference\/#more-222737\">Read more<span class=\"screen-reader-text\">Does Python pass by value or reference?<\/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-222737","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 value or reference?<\/title>\n<meta name=\"description\" content=\"Introduction One of the fundamental concepts in Python programming is how function arguments are passed and how values are assigned to variables.\" \/>\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\/does-python-pass-by-value-or-reference\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Does Python pass by value or reference?\" \/>\n<meta property=\"og:description\" content=\"Introduction One of the fundamental concepts in Python programming is how function arguments are passed and how values are assigned to variables.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/namso-gen.co\/blog\/does-python-pass-by-value-or-reference\/\" \/>\n<meta property=\"og:site_name\" content=\"Namso Gen Blog - 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