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python 深拷贝和浅拷贝浅析

简单点说

1. copy.copy 浅拷贝 只拷贝父对象,不会拷贝对象的内部的子对象。id会变化
2. copy.deepcopy 深拷贝 拷贝对象及其子对象。id会变化

 

>>> 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]]                            

 

 

 

 

 

 

 

 

 

 

 

 

 

 

dd

python 深拷贝和浅拷贝浅析