how to test if an object came from os.walk()

[Skaperen]

i am writing a function that is to be given an object that came from os.walk(). i like to do thorough error checks in code i write, at least for final release. os.walk() returns a generator. is there a way to be more specific and detect that the given object is a generator from os.walk() as opposed to some other kind of generator? should i even be trying to do this and, instead, allow callers to pass a generator that looks and quacks like a generator from os.walk()?

how would you go about testing for just a generator, since

isinstance(foo,generator)

does not work, because generator is not defined. is there something i can import to get this definition, or should i just do

isinstance(foo,type(os.walk()))

?