inspecting a callable for the arguments it accepts
Gregory Ewing
greg.ewing at canterbury.ac.nz
Wed Nov 15 00:34:20 EST 2017
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
More information about the Python-list
mailing list