Knowing the signature of a function

Xavier Décoret Xavier.Decoret at
Wed Jun 8 14:21:54 CEST 2005


I have the following code:

def foo(x,y):

How can I query the function object foo to know the number of parameters 
it expects.  I can find it is a function using callable(f), I can find 
some information (listed by dir(foo)) such as the name of the 
function,etc.. but nowhere I can find the number of arguments.

I would like to know wether the function expects one or zero arguments.

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