How to copy python code

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.

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:

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]]

Deep copy:

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]]

list to assign value

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]]

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