python深拷贝和浅拷贝

# copy deep copy 浅拷贝是对一个对象的顶层拷贝。只拷贝了引用，没拷贝内容 深拷贝就是真的开辟一段新的空间存它

import copy

a = [1, 2]

b = a

print(a, b, id(a), id(b))



a[0] = 2

print(a, b, id(a), id(b))



a[0] = 1
# 浅拷贝
b = copy.copy(a)

a[0] = 2

print(a, b, id(a), id(b))



a[0] = 1
# 深拷贝
b = copy.deepcopy(a)

a[0] = 2

print(a, b, id(a), id(b))