Question

Possible Duplicate:
How to find out the arity of a method in Python

For example I have declared a function:

def sum(a,b,c):
    return a + b + c

I want to get length of arguments of “sum” function.
somethig like this: some_function(sum) to returned 3

How can it be done in Python?

Update:
I asked this question because I want to write a function that accepts another function as a parameter and arguments to pass it.

def funct(anotherFunct, **args): 

and I need to validate:

if(len(args) != anotherFuct.func_code.co_argcount):
    return "error"

Answer 1

If your method name is sum then sum.func_code.co_argcount will give you number of arguments.