A brief analysis of Python deep copy and shallow copy

Source: Internet
Author: User
Tags shallow copy

Simply Put.

1. copy.copy A shallow copy copies only the parent object and does not copy the inner sub-objects of the Object. The ID will Change.
2. copy.deepcopy a deep copy of the object and its child Objects. The ID will Change.

>>>Import Copy>>> a=[1,2,3,[4,5,6]]>>> b=a #普通赋值>>> c=copy.copy (a) #浅拷贝>>> d=copy.deepcopy (a) #深拷贝>>>print (a,b,c,d) [1,2,3, [4,5,6]] [1,2,3, [4,5,6]] [1,2,3, [4,5,6]] [1,2,3, [4,5,6]]#------------------------------------------------------------------------------>>> a[3].append ("Chen")>>>print (a) [1,2,3, [4,5,6,'Chen']]>>>print (b) [1,2,3, [4,5,6,'Chen']]>>>print (c) [1,2,3, [4,5,6,'Chen']]>>>print (d) [1,2,3, [4,5,6]]#------------------------------------------------------------------------------>>> A.append ("Wang")>>>print (a) [1,2,3, [4,5,6,'Chen'],'Wang']>>>print (b) [1,2,3, [4,5,6,'Chen'],'Wang']>>>print (c) [1,2,3, [4,5,6,'Chen']]>>>print (d) [1,2,3, [4,5,6]]


A brief analysis of Python deep copy and shallow copy

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