What is a shallow copy? <\/strong><\/p>\n\n\n\n A shallow<\/strong> copy\u00a0is a bit-wise\u00a0copy\u00a0of an object. A new object is created that has an exact\u00a0copy\u00a0of the values in the original object. So, if you need the original list unchanged when the new list is modified, you can use the copy() method. <\/p>\n\n\n\n Techniques to shallow copy :<\/strong><\/p>\n\n\n\n It doesn’t return any value and doesn’t modify the original list.<\/p>\n\n\n\n In the example Copying the list of the fruits. It’s a copy list\u00a0without changing the original<\/strong> list.<\/p>\n\n\n\n Output:<\/strong><\/p>\n\n\n\n Techniques to deep copy :<\/p>\n\n\n\n Example of deep copy<\/strong><\/em><\/p>\n\n\n\n Output: <\/strong><\/p>\n\n\n\n The new list created using copy.deepcopy() : [1, 2, 3, 4, 5] A way to copy a list by value:<\/p>\n\n\n\n If the list contains objects and you want to copy them as well, use a generic copy.deepcopy():<\/p>\n\n\n\n The difference between Deep Copy vs Shallow copy is that Deep copy means if we modify any of the lists, changes are reflected in both lists as they point to the same reference. Whereas in shallow copy, when we add an element in any of the lists, only that list is modified. <\/p>\n\n\n\n Answer:<\/strong> Same as above you can use the copy function to copy the list of the list:<\/p>\n\n\n\n Output<\/strong>: [[1, 2], [3, 4]]<\/p>\n\n\n\n Answer:<\/strong> You can Copy the list in various ways like:<\/p>\n\n\n\n You can use the built-in\u00a0 You can slice<\/a> it:<\/p>\n\n\n\n You can use the built-in\u00a0 You can use generic This is a little slower than If the list contains objects and you want to copy them as well, use generic Complete Example <\/strong><\/p>\n\n\n\n Output:<\/strong><\/p>\n\n\n\n Do comment if you have any examples, doubts, and suggestions on this tutorial.<\/p>\n\n\n\nSyntax<\/strong><\/h3>\n\n\n\n
\nlist.copy()\n<\/pre>\n\n\n\n
Parameter Values<\/strong><\/h3>\n\n\n\n
Python list copy Function Examples <\/strong><\/h3>\n\n\n\n
Copy\/clone List example <\/strong><\/h3>\n\n\n\n
fruits = ['apple', 'banana', 'cherry', 'orange']\r\n\r\ncopy_fruits = fruits.copy()\r\n\r\nprint(copy_fruits)\r\n<\/code><\/pre>\n\n\n\n![\"Python](\"https:\/\/i0.wp.com\/tutorial.eyehunts.com\/wp-content\/uploads\/2021\/08\/Python-list-copy-Function.jpg?resize=522%2C120&ssl=1\")
<\/figure><\/div>\n\n\n\nPython list copy deep<\/strong><\/h2>\n\n\n\n
\nimport copy\n\nlist1 = [1, 2, 3, 4]\n\n# Using deep copy techniques to create a deep copy\nlist2 = list1\nlis3 = copy.deepcopy(list1)\n\n# Adding new element to new lists\nlist2.append(5)\nlis3.append(5)\n\n# Printing lists after adding new element\n# changes reflected in old list\nprint(\"The new list created using copy.deepcopy() : \" + str(list2))\nprint(\"The new list created using = : \" + str(lis3))\nprint(\"The old list : \" + str(list2))\n\n<\/pre>\n\n\n\n
The new list created using = : [1, 2, 3, 4, 5]
The old list : [1, 2, 3, 4, 5]<\/p>\n\n\n\nCopy list by value in Python <\/strong><\/h3>\n\n\n\n
new_list = old_list[:]<\/code><\/pre>\n\n\n\nimport copy\nnew_list = copy.deepcopy(old_list)<\/code><\/pre>\n\n\n\nDeep Copy vs Shallow copy<\/strong><\/h3>\n\n\n\n
Q: How to python copy a list of lists?<\/strong><\/h3>\n\n\n\n
\nlist1 = [[1, 2], [3, 4]]\n\nlist2 = list1.copy()\n\nprint(list2)\n\n<\/pre>\n\n\n\n
Q: What are the options to clone or copy a list in Python?<\/strong><\/h3>\n\n\n\n
list.copy()<\/code><\/a>\u00a0method (available since Python 3.3):<\/p>\n\n\n\nnew_list = old_list.copy()<\/code><\/pre>\n\n\n\nnew_list = old_list[:]<\/code><\/pre>\n\n\n\nlist()<\/a><\/code>\u00a0function:<\/p>\n\n\n\nnew_list = list(old_list)<\/code><\/pre>\n\n\n\ncopy.copy()<\/code><\/a>:<\/p>\n\n\n\nimport copy\nnew_list = copy.copy(old_list)<\/code><\/pre>\n\n\n\nlist()<\/code> because it has to find out the datatype of old_list<\/code> first.<\/p>\n\n\n\ncopy.deepcopy()<\/code><\/a>:<\/p>\n\n\n\nimport copy\nnew_list = copy.deepcopy(old_list)<\/code><\/pre>\n\n\n\n\nimport copy\n\nclass Foo(object):\n def __init__(self, val):\n self.val = val\n\n def __repr__(self):\n return 'Foo({!r})'.format(self.val)\n\nfoo = Foo(1)\n\na = ['foo', foo]\nb = a.copy()\nc = a[:]\nd = list(a)\ne = copy.copy(a)\nf = copy.deepcopy(a)\n\n# edit orignal list and instance \na.append('baz')\nfoo.val = 5\n\nprint('original: %r\\nlist.copy(): %r\\nslice: %r\\nlist(): %r\\ncopy: %r\\ndeepcopy: %r'\n % (a, b, c, d, e, f))\n<\/pre>\n\n\n\n![\"Python](\"https:\/\/i0.wp.com\/tutorial.eyehunts.com\/\/wp-content\/uploads\/2020\/05\/Python-list-copy-Function.png?resize=430%2C232&ssl=1\")
<\/figure><\/div>\n\n\n\n