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>>> a = {1: [1,2,3]}
>>> b = a.copy()
>>> a, b
({1: [1, 2, 3]}, {1: [1, 2, 3]})
>>> a[1].append(4)
>>> a, b
({1: [1, 2, 3, 4]}, {1: [1, 2, 3, 4]})

>>> import copy
>>> c = copy.deepcopy(a)
>>> a, c
({1: [1, 2, 3, 4]}, {1: [1, 2, 3, 4]})
>>> a[1].append(5)
>>> a, c
({1: [1, 2, 3, 4, 5]}, {1: [1, 2, 3, 4]})

#!/usr/bin/python
# -*-coding:utf-8 -*-

import copy
a = [1, 2, 3, 4, ['a', 'b']] #original object

b = a                       #assignment, passing the reference of the 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 )

('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']])