On Jun 18, 3:13 pm, Cédric Lucantis <[EMAIL PROTECTED]> wrote: > Hi, > > Le Wednesday 18 June 2008 20:19:12 [EMAIL PROTECTED], vous avez écrit : > > > Hi. I am looking for a way to check if some given set of (*args, > > **kwds) conforms to the argument specification of a given function, > > without calling that function. > > > For example, given the function foo: > > def foo(a, b, c): pass > > > and some tuple args and some dict kwds, is there a way to tell if i > > _could_ call foo(*args, **kwds) without getting an exception for those > > arguments? I am hoping there is a way to do this without actually > > writing out the argument logic python uses. > > Each function object is associated to a code object which you can get with > foo.func_code. Two of this object's attributes will help you: co_argcount and > co_varnames. The first is the number of arguments of the function, and the > second a list of all the local variables names, including the arguments > (which are always the first items of the list). When some arguments have > default values, they are stored in foo.func_defaults (and these arguments are > always after non-default args in the co_argnames list). > > Finally, it seems that some flags are set in code.co_flags if the function > accepts varargs like *args, **kwargs, but I don't know where these are > defined. > > Note that I never found any doc about that and merely guessed it by playing > with func objects, so consider all this possibly wrong or subject to change. > > -- > Cédric Lucantis
I am aware of these attributes, although you can get them all in a more organized form using the getfullargspec function in the inspect module from the standard library. The problem is that using these attributes, I would essentially have to re-write the logic python uses when calling a function with a given set of arguments. I was hoping there is a way to get at that logic without rewriting it. -- http://mail.python.org/mailman/listinfo/python-list
