深浅拷贝（十四）

浅拷贝

lst = [[1, 2], 3, 4]
from_lst = lst.copy()   # 浅拷贝
print(from_lst) # [[1, 2], 3, 4]
from_lst[1] = 3333  # 修改这个元素的值，不影响lst
print(from_lst)  # [[1, 2], 3333, 4]
print(lst)  # [[1, 2], 3, 4]

from_lst[0][1] = 2222
print(from_lst) # [[1, 2222], 3333, 4]
print(lst) # [[1, 2222], 3, 4]

深拷贝

import copy
lst = [[1, 2], 3, 4]
from_lst = copy.copy(lst)   # 浅拷贝
print(from_lst) # [[1, 2], 3, 4]

deep_lst = copy.deepcopy(lst) # 深拷贝
print(deep_lst) # [[1, 2], 3, 4]
deep_lst[0][1] = 1111 # 不影响原来的lst
print(deep_lst)     # [[1, 1111], 3, 4]
print(lst)     # [[1, 2], 3, 4]