Programmatically pass unknown number of parameters in Python

Question

I'd like an easy way to plug in a function and arguments to be executed later so I can have a kind of wrapper around it.

In this case, I'd like to use it to benchmark, example:

def timefunc(fn, *args):
   start = time.clock()
   fn(args)
   stop = time.clock()
   return stop - start

How do I pass arguments where the number of parameters aren't known? How do I find the number of parameters? How would I even call the function once I knew the number of parameters?

Answer 1

Just call the function like this:

fn(*args)

Answer 2

MatrixFrog's answer is the correct one, but just to complete the picture. For finding out the number of arguments simply call len, because args is a tuple:

import time

def timefunc(fn, *args):
   start = time.clock()
   print len(args), type(args)
   fn(*args)
   stop = time.clock()
   return stop - start


def myfoo(a, b):
    c = a + b
    return c


timefunc(myfoo, 5, 6)

The print statement inside timefunc prints:

2 <type 'tuple'>

Since args is a tuple, you can access it like any other tuple.