[Python] Python inspect.getargspec with built-in function

I'm trying to figure out the arguments of a method retrieved from a module. I found an inspect module with a handy function, getargspec. It works for a function that I define, but won't work for functions from an imported module.

import math, inspect
def foobar(a,b=11): pass
inspect.getargspec(foobar) # this works
inspect.getargspec(math.sin) # this doesn't


I'll get an error like this:

File "C:\...\Python 2.5\Lib\inspect.py", line 743, in getargspec
raise TypeError('arg is not a Python function')
TypeError: arg is not a Python function


Is inspect.getargspec designed only for local functions or am I doing something wrong?

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