深拷贝与浅拷贝 copy和deepcopy
浅拷贝就是只复制地址 深拷贝就是复制地址所指的那个文件
a = [1,2,3]
a = b
a = [1,2,3]
b = copy.deepcopy(a)
a = [1,2,3]
b = [4,5,6]
c = [a,b]
d = copy.deepcopy( c)
a = [1,2,3]
b = [4,5,6]
c = [a,b]
d = copy.copy( c)
a = [1,2,3]
b = [4,5,6]
c = (a,b) #换成元组不可变类型
d = copy.copy( c) #如果用deepcopy和第三张图一样