Python: Copy copy (deep copy deepcopy and shallow copy copy)

When assigning values between objects in Python is passed by reference, the copy module in the standard library is required if the object needs to be copied.

1. Copy.copy a shallow copy copies only the parent object and does not copy the inner child objects of the object.

2. Copy.deepcopy deep copy Copy object and its sub-object

>>>Import Copy>>> a = [1,2,3,4,['a','b']] #原始对象>>> B =a #赋值, a reference to a passing object>>> C =Copy.copy (a)>>> d =Copy.deepcopy (a)>>> A.append (5)>>> a[4].append ('C')>>> Print'a=', AA= [1,2,3,4, ['a','b','C'],5]>>> Print'b=', BB= [1,2,3,4, ['a','b','C'],5]>>> Print'c=', CC= [1,2,3,4, ['a','b','C']]>>> Print'd=', DD= [1,2,3,4, ['a','b']]

Original link: http://www.cnblogs.com/Richardzhu/p/4723750.html

Python: Copy copy (deep copy deepcopy and shallow copy copy)