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There are different ways to do this in Python 2 and 3. The Python 2 ways will also work in Python 3. Python 2. In Python 2, the idiomatic way of making a shallow copy of a list is with a complete slice of the original: a_copy = a_list[:] You can also accomplish the same thing by passing the list through the list constructor, a_copy = list(a_list)
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- Using slicing technique. This is the easiest and the fastest way to clone a list. This method is considered when we want to modify a list and also keep a copy of the original.
- Using the extend() method. The lists can be copied into a new list by using the extend() function. This appends each element of the iterable object (e.g., anothre list) to the end of the new list.
- Using the list() method. This is the simplest method of cloning a list by using the builtin function list(). This takes about 0.075 seconds to complete. Example
- Using the method of Shallow Copy. This method of copying using copy.copy is well explained in the article Shallow Copy. This takes around 0.186 seconds to complete.
1 day ago · This module provides generic shallow and deep copy operations (explained below). Interface summary: copy.copy(obj) ¶. Return a shallow copy of obj. copy.deepcopy(obj[, memo]) ¶. Return a deep copy of obj. copy.replace(obj, /, **changes) ¶. Creates a new object of the same type as obj, replacing fields with values from changes.
Sep 14, 2022 · This tutorial will teach you how to copy or clone a list using several different techniques: The assignment operator. The slicing syntax. The list.copy () method. The copy.copy () function. The copy.deepcopy () function. We will also discuss their usage and technical aspects in detail.
3 Things to Remember. Making a shallow copy of an object won’t clone child objects. Therefore, the copy is not fully independent of the original. A deep copy of an object will recursively clone child objects. The clone is fully independent of the original, but creating a deep copy is slower.
Jul 6, 2019 · In Python, there are two ways to create copies: Shallow Copy: A shallow copy means constructing a new object and then populating it with references to the child objects found in the original ...
Jul 26, 2024 · Syntax of Python Shallowcopy. Syntax: copy.copy (x) Example: In order to make these copies, we use the copy module. The copy () returns a shallow copy of the list, and deepcopy () returns a deep copy of the list. As you can see that both have the same value but have different IDs. Example: This code showcases the usage of the copy module to ...
