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>>> B
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Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name 'instance' is not defined
>>> print isinstance(A,objA)
True
>>> print isinstance(B,tuple)
True
>>> print isinstance(C,tuple)
False
>>> print isinstance(C,string)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name 'string' is not defined
>>> print isinstance(C,basestring)
True
>>>
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