复制列表-python基础学习

最新推荐文章于 2025-11-25 11:44:22 发布

原创最新推荐文章于 2025-11-25 11:44:22 发布 · 165 阅读

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本文通过实例详细解析了Python中列表的深拷贝与浅拷贝的区别，展示了如何通过切片操作实现列表的深拷贝，避免直接赋值导致的列表关联问题，确保两个列表独立变化。

❶ my_foods = [‘pizza’, ‘falafel’, ‘carrot cake’]
❷ friend_foods = my_foods[:]
print(“My favorite foods are:”)
print(my_foods)
print("\nMy friend’s favorite foods are:")
print(friend_foods)

结果：
My favorite foods are:
[‘pizza’, ‘falafel’, ‘carrot cake’]
My friend’s favorite foods are:
[‘pizza’, ‘falafel’, ‘carrot cake’]

my_foods = [‘pizza’, ‘falafel’, ‘carrot cake’]
❶ friend_foods = my_foods[:]
❷ my_foods.append(‘cannoli’)
❸ friend_foods.append(‘ice cream’)
print(“My favorite foods are:”)
print(my_foods)
print("\nMy friend’s favorite foods are:")
print(friend_foods)

结果：
My favorite foods are:
❹ [‘pizza’, ‘falafel’, ‘carrot cake’, ‘cannoli’]
My friend’s favorite foods are:
❺ [‘pizza’, ‘falafel’, ‘carrot cake’, ‘ice cream’]

切片复制，两个列表无关联

直接赋值，两个列表有关联
my_foods = [‘pizza’, ‘falafel’, ‘carrot cake’]
#列表会关联，尽量避免如此赋值
❶ friend_foods = my_foods
my_foods.append(‘cannoli’)
friend_foods.append(‘ice cream’)
print(“My favorite foods are:”)
print(my_foods)
print("\nMy friend’s favorite foods are:")
print(friend_foods)