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 -- http://mail.python.org/mailman/listinfo/python-list
