Python Copy Object

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
A good example:

ImportCopy
A= [1, 2, 3, 4, ['a', 'b']] #Original Object

b=a#assignment, a reference to a passing object
C=Copy.copy (a)#object Copy, shallow copy
D=Copy.deepcopy (a)#object Copy, deep copy

A.append (5) #Modify Object A
a[4].append ('C') #Modify the [' A ', ' B '] Array object in Object a

Print '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 ']]