detecting a generstor passed to a funtion

[Skaperen]

what is the appropriate pythonic way for a function to detect that a generator is passed to it? i can do this:

if type(arg).__name__=='generator':
    print('got a generator')
else:
    print('did not get a generator')

i cannot do:

if isinstance(arg,generator):
    print('got a generator')
else:
    print('did not get a generator')

because generator is not defined.