Knowing the signature of a function

[Steven D'Aprano]

On Wed, 08 Jun 2005 08:35:39 -0400, Kent Johnson wrote:

>> How can I query the function object foo to know the number of parameters 
>> it expects.  I can find it is a function using callable(f), I can find 
>> some information (listed by dir(foo)) such as the name of the 
>> function,etc.. but nowhere I can find the number of arguments.
>> 
>> I would like to know wether the function expects one or zero arguments.
> 
> foo.func_code.co_argcount gives the count of named args. 
> len(foo.func_code.co_varnames) gives the total number of arguments
> including *args and **kwds args. inspect.getargspec() might also be
> helpful.

You guys are amazing, have you been spying on me? :-) I was just about to
write in with the same question. Thanks for answering before I asked.

-- 
Steven.