Chris Angelico wrote:

wants_one_arg.__code__.co_argcount


1

wants_one_arg.__code__.co_varnames

('x',)

That will give you some idea, but it's not foolproof -- e.g.
if the function has * or ** arguments, it's impossible to tell
in general how many arguments it accepts without studying the
code (and maybe not even then -- halting problem, etc.)

Some of the co_flags seem to indicate presence of * and **:

0x04 - has *args
0x08 - has **kwds

In Py3 there is also co_kwonlyargcount.

--
Greg
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