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>>> import copy
>>> a = [1,2,3,4,['a','v']]
>>> b = a
>>> b
[1, 2, 3, 4, ['a', 'v']]
>>> c = copy.copy(a)
>>> c
[1, 2, 3, 4, ['a', 'v']]
>>> d = copy.deepcopy(a)
>>> d
[1, 2, 3, 4, ['a', 'v']]
>>> a.append(5)
>>> a
[1, 2, 3, 4, ['a', 'v'], 5]
>>> b
[1, 2, 3, 4, ['a', 'v'], 5]
>>> c
[1, 2, 3, 4, ['a', 'v']]
>>> d
[1, 2, 3, 4, ['a', 'v']]
>>> a[4].append('c')
>>> a
[1, 2, 3, 4, ['a', 'v', 'c'], 5]
>>> b
[1, 2, 3, 4, ['a', 'v', 'c'], 5]
>>> c
[1, 2, 3, 4, ['a', 'v', 'c']]
>>> d
[1, 2, 3, 4, ['a', 'v']]
>>>


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>>> class objA:
...     pass
...
>>> A = objA()
>>> B = 'a','V'
>>> B
('a', 'V')
>>> C = 'a string'
>>> print instance(A,objA)
Traceback (most recent call last):
  File "<stdin>", line 1, in < ......
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