nriley

class Foo(object):

    def is_it_a_foo(self, other):
        print issubclass(Foo, other)

Foo().is_it_a_foo(Foo)

nriley

>>> class Old: pass
... 
>>> type(Old)
<type 'classobj'>
>>> class New(object): pass
... 
>>> type(New)
<type 'type'>