Class definitions deriving from object

Possible Duplicate:
Old style and new style classes in Python
python class inherits object

What's the difference between

class foo: 

and

class foo(object):

Can anyone explain why we are using object in class definition?

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In Python 2.x the first declaration is an old-style class and the second version is a new-style class. You should always use new-style classes for new code.

In Python 3 all classes are new-style so there is no difference.

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