"isinstance" question

[Satish Eerpini]

>
>    I want to test whether an object is an instance of any user-defined
>> class.  "isinstance" is less helpful than one would expect.
>>
>>  >>> import types
>>  >>> class foo() : # define dummy class
>> ...     pass
>> ...
>>  >>> x = foo()
>>  >>>
>>  >>> type(x)
>> <type 'instance'>
>>  >>>
>>  >>> isinstance(x, types.ClassType)
>> False
>>  >>> isinstance(x, types.InstanceType)
>> True
>>  >>> foo
>> <class __main__.foo at 0x004A2BD0>
>>  >>> x
>> <__main__.foo instance at 0x020080A8>
>>
>> So far, so good. x is an InstanceType.  But let's try a
>> class with a constructor:
>>
>>  >>> class bar(object) :
>> ...    def __init__(self, val) :
>> ...      self.val = val
>> ...
>>  >>> b = bar(100)
>>  >>> b
>> <__main__.bar object at 0x01FF50D0>
>>  >>> isinstance(b, types.InstanceType)
>> False
>>  >>> isinstance(b, types.ClassType)
>> False
>>  >>>>>> bar
>> <class '__main__.bar'>
>>
>> well the same code on my side returns true when you run isinstance(b,
types.InstanceType) even when the class has a constructor. Why is there a
difference in the output when we are both using Cython 2.6 ?? (2.6.4 to be
exact)

Cheers
Satish
-- 
http://satisheerpini.net
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