Python Learning copy Module

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 sub-objects of the object.
2. copy.deepcopy deep copy copy objects and their sub-objects

1 ImportCopy2A = [1, 2, 3, 4, ['a','b']]#Original Object3 4b = A#assignment, a reference to a passing object5c = Copy.copy (a)#object Copy, shallow copy6D = Copy.deepcopy (a)#object Copy, deep copy7 8A.append (5)#Modify Object A9A[4].append ('C')#Modify the [' A ', ' B '] Array object in Object aTen  One Print 'A =', a A Print 'B =', b - Print 'C =', C - Print 'd ='D

Output Result:
A = [1, 2, 3, 4, [' A ', ' B ', ' C '], 5]
b = [1, 2, 3, 4, [' A ', ' B ', ' C '], 5]
c = [1, 2, 3, 4, [' A ', ' B ', ' C ']]
D = [1, 2, 3, 4, [' A ', ' B ']]

On the other hand, you determine whether the object is a copy, and you can use the IS operator to identify it.
A is B, True A and B refer to the same object, not copy
-A and B are copying objects to each other

Python Learning copy Module