1. Definition (What the copy() Function Does)
The copy() function is a built-in Python list method used to create a shallow copy of an existing list.
When you use this method, Python creates a new list object that contains the same elements as the original. This ensures that changes made to the new list do not affect the original—as long as the elements are not nested lists or other mutable objects.
It acts like duplicating a list’s structure while keeping both lists independent at the top level.
2. Purpose of Using copy()
The main purpose of the copy() function is to create a separate, independent version of a list. This becomes helpful when:
- You want to modify or transform a list without altering the original.
- You need a backup or reference copy before performing operations.
- You want to avoid accidental changes caused by referencing the same memory location.
- You are performing comparisons between original and modified versions.
In short, copy() helps you avoid unintended side effects when working with lists.
3. Syntax of the copy() Method
new_list = original_list.copy()
4. Parameter Description
| Parameter | Description |
|---|---|
| None | The copy() method does not take any parameters. |
A shallow copy replicates only the outer list. Nested lists or objects inside remain referenced.