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How to copy python code

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Release： 2024-04-20 19:19:40

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There are two ways to copy blocks of code in Python: shallow copying or deep copying using the copy module. For lists, direct assignment makes a shallow copy.

How to copy python code

Python code copy method

How to copy code blocks in Python?

In Python, there are two main ways to copy blocks of code:

Method 1: Using the `copy` module

## The #copy module provides copy and deepcopy functions for shallow copying and deep copying. Shallow copy only copies the reference of an object, while deep copy recursively copies the object and all its sub-objects.

Shallow copy:

<code class="python">import copy

original_list = [1, 2, [3, 4]]
copied_list = copy.copy(original_list)

# 修改 copied_list 中的嵌套列表
copied_list[2][1] = 5

# 输出 original_list 和 copied_list
print(original_list)  # [1, 2, [3, 5]]
print(copied_list)  # [1, 2, [3, 5]]</code>

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Deep copy:

<code class="python">import copy

original_list = [1, 2, [3, 4]]
copied_list = copy.deepcopy(original_list)

# 修改 copied_list 中的嵌套列表
copied_list[2][1] = 5

# 输出 original_list 和 copied_list
print(original_list)  # [1, 2, [3, 4]]
print(copied_list)  # [1, 2, [3, 5]]</code>

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Method 2: Use

list `to assign value`

For list type data, you can use direct assignment to copy. This is a form of shallow copying.

<code class="python">original_list = [1, 2, [3, 4]]
copied_list = original_list

# 修改 copied_list 中的嵌套列表
copied_list[2][1] = 5

# 输出 original_list 和 copied_list
print(original_list)  # [1, 2, [3, 5]]
print(copied_list)  # [1, 2, [3, 5]]</code>

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