{"id":6850,"date":"2025-01-27T06:19:15","date_gmt":"2025-01-27T06:19:15","guid":{"rendered":"https:\/\/ubiq.co\/tech-blog\/?p=6850"},"modified":"2025-01-29T05:11:04","modified_gmt":"2025-01-29T05:11:04","slug":"how-to-clone-list-in-python","status":"publish","type":"post","link":"https:\/\/ubiq.co\/tech-blog\/how-to-clone-list-in-python\/","title":{"rendered":"How to Clone List in Python"},"content":{"rendered":"\n<p>Often software developers need to be able to create copies of lists in Python. This is commonly required if you do not want to modify existing lists but want to perform certain tasks on its copy. Typically, developers loop through the original list and append each of its items to an empty list, one by one. This is tedious and slow. There are several simple ways to copy list in Python. In this article, we will learn how to clone list in Python.<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 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\" style=\"cursor:inherit\">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:\/\/ubiq.co\/tech-blog\/how-to-clone-list-in-python\/#How_to_Clone_List_in_Python\" >How to Clone List in Python<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/ubiq.co\/tech-blog\/how-to-clone-list-in-python\/#1_Using_built-in_copy_function\" >1. Using built-in copy() function<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/ubiq.co\/tech-blog\/how-to-clone-list-in-python\/#2_Using_slicing_method\" >2. Using slicing method<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/ubiq.co\/tech-blog\/how-to-clone-list-in-python\/#3_Using_list_constructor\" >3. Using list() constructor<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/ubiq.co\/tech-blog\/how-to-clone-list-in-python\/#4_Using_copycopy_function\" >4. Using copy.copy() function<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/ubiq.co\/tech-blog\/how-to-clone-list-in-python\/#5_Using_list_comprehension\" >5. Using list comprehension<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/ubiq.co\/tech-blog\/how-to-clone-list-in-python\/#6_Using_deepcopy_function\" >6. Using deepcopy() function<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/ubiq.co\/tech-blog\/how-to-clone-list-in-python\/#Conclusion\" >Conclusion<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_to_Clone_List_in_Python\"><\/span>How to Clone List in Python<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Here are the different ways to clone list in Python.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1_Using_built-in_copy_function\"><\/span>1. Using built-in copy() function<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Since Python 3.3, every Python list comes with a built-in function copy() that can be used to clone a list in Python. Here is its syntax.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">copy_list = original_list.copy()<\/pre>\n\n\n\n<p>Here is an example to copy list using this function.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">a = [1, 2, 3, 4, 5]<br>b = a.copy()<br>print(b) # output is [1, 2, 3, 4, 5]<\/pre>\n\n\n\n<p>It provides a clean copy so that even if the original list is modified it does not affect the copied list.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">a[1]=6<br>print(a) # output is [1, 6, 3, 4, 5]<br>print(b) # output is [1, 2, 3, 4, 5]<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2_Using_slicing_method\"><\/span>2. Using slicing method<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Python provides <a href=\"https:\/\/ubiq.co\/tech-blog\/how-slicing-in-python-works\/\">slicing<\/a> operation to extract a specific sub-list from a given list. Here is its syntax.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">extract = original_list_or_string[start:end]<\/pre>\n\n\n\n<p>In the above command, slicing operator can be used on a list or a string. It accepts two optional parameters &#8211; start and end index to extract the sublist or substring.<\/p>\n\n\n\n<p>It can also be used to create a copy of a list.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">a = [1, 2, 3, 4, 5]<br>b = a[:]<br>print(b) # output is [1, 2, 3, 4, 5]<\/pre>\n\n\n\n<p>Here too it provides a clean copy that is not connected to original list.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">a[1]=6<br>print(a) # output is [1, 6, 3, 4, 5]<br>print(b) # output is [1, 2, 3, 4, 5]<\/pre>\n\n\n\n<p>In fact, cloning list using slicing operator is the fastest way to copy a list. Although it has a weird syntax and is not the original purpose of slicing, it works great for all kinds of lists.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"3_Using_list_constructor\"><\/span>3. Using list() constructor<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Python also provides a list constructor that accepts an iterable such as list, string, dict, etc. and returns a list. Here is its syntax.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">list(iterable)<\/pre>\n\n\n\n<p>Here is an example to copy list using list() constructor.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">a = [1, 2, 3, 4, 5]<br>b = list(a)<br>print(b) # output is [1, 2, 3, 4, 5]<\/pre>\n\n\n\n<p>This method also provides a completely new list, instead of providing a new reference to original list. Modifying original list will not affect the new list.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">a[1]=6<br>print(a) # output is [1, 6, 3, 4, 5]<br>print(b) # output is [1, 2, 3, 4, 5]<\/pre>\n\n\n\n<p>Please note, list constructor only works with iterables. You cannot pass item values to it and get a list in return.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"4_Using_copycopy_function\"><\/span>4. Using copy.copy() function<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Python also provides a <em>copy<\/em> module that offers several functions to copy data. Among them copy() is a simple function that allows you to easily get a shallow copy of a Python object. Here is its syntax.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">import copy<br>a = [1, 2, 3, 4, 5]<br>b = copy.copy(a)<br>print(b) # output is [1, 2, 3, 4, 5]<\/pre>\n\n\n\n<p>But in case of lists, it provides a clean copy that has no link to original list.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">a[1]=6<br>print(a) # output is [1, 6, 3, 4, 5]<br>print(b) # output is [1, 2, 3, 4, 5]<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"5_Using_list_comprehension\"><\/span>5. Using list comprehension<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>You can also use list comprehension for this purpose. List comprehensions are reasonably fast and work well with small or big lists.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">a = [1, 2, 3, 4, 5]<br>b = [i for i in a]<br>print(b) # output is [1, 2, 3, 4, 5]<\/pre>\n\n\n\n<p>This method also provides a separate copy of list.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">a[1]=6<br>print(a) # output is [1, 6, 3, 4, 5]<br>print(b) # output is [1, 2, 3, 4, 5]<\/pre>\n\n\n\n<p>One advantage of this method is that you can customize your list comprehension to selectively copy one or more list items, instead of copying all items.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"6_Using_deepcopy_function\"><\/span>6. Using deepcopy() function<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>The <em>copy<\/em> module also provides deepcopy() function that allows you to do a deep copy of objects. You can also use it to clone lists. Here is its syntax.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">copy_list = copy.deepcopy(original_list)<\/pre>\n\n\n\n<p>Here is an example to clone list using deepcopy.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">import copy<br>a = [1, 2, 3, 4, 5]<br>b = copy.deepcopy(a)<br>print(b) # output is [1, 2, 3, 4, 5]<\/pre>\n\n\n\n<p>Since the cloned list is a deep copy, it does not change if the original list is modified.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">a[1]=6<br>print(a) # output is [1, 2, 3, 4, 5]<br>print(b) \/\/ output is [1, 6, 3, 4, 5]<\/pre>\n\n\n\n<p>Please note, since deep copying requires more operations than shallow copying, it is slower than other solutions mentioned above.<\/p>\n\n\n\n<p>If your list items are simple data types such as numbers and strings, then copy() and deepcopy() work same way. If your list contains complex objects such as dict or <a href=\"https:\/\/ubiq.co\/tech-blog\/how-to-flatten-list-of-lists-in-python\/\">list of lists<\/a>, then deepcopy() will be slower.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>In this article, we have learnt several different ways to clone list in Python. Please note, in older Python versions, many of these solutions may have produced shallow copy where modifying the original list also modified the copy. But in recent Python versions, they all produce deep copies, where the cloned list has no link to the original list. Among them, using slicing method is the fastest and using copy.deepcopy() function is the slowest. Nevertheless, you can use any of the above solutions.<\/p>\n\n\n\n<p>Also read:<\/p>\n\n\n\n<p><a href=\"https:\/\/ubiq.co\/tech-blog\/how-to-delete-file-or-folder-in-python\/\">How to Delete File or Folder in Python<\/a><br><a href=\"https:\/\/ubiq.co\/tech-blog\/how-to-copy-files-in-python\/\">How to Copy Files in Python<\/a><br><a href=\"https:\/\/ubiq.co\/tech-blog\/how-to-iterate-over-rows-in-pandas-dataframe\/\">How to Iterate Over Rows in Pandas<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Often Python developers need to copy lists. Here are different ways to clone list in Python.<\/p>\n","protected":false},"author":1,"featured_media":6875,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[301],"tags":[380,381],"class_list":["post-6850","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-python","tag-clone-list","tag-copy-list"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Clone List in Python - Ubiq BI<\/title>\n<meta name=\"description\" content=\"Often Python developers need to copy lists. 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