Aargh! Function takes exactly x arguments, y given..

[Chris Tavares]

"David C. Ullrich" <ullrich at math.okstate.edu> wrote in message
news:3b2f3759.467766 at nntp.sprynet.com...
> On Mon, 18 Jun 2001 08:19:30 -0700, Erik Max Francis <max at alcyone.com>
> wrote:
>
> >Anders And wrote:
> >
> >> I am a happy pythoneer using a combination of C++ and Python for my
> >> everyday
> >> work.
> >> Usually, debugging is easy but every now and then, I get the "function
> >> takes
> >> exactly x arguments, y given" error message, clearly due to some other
> >> problem than what Python thinks. Does anybody have any experience with
> >> this
> >> particular error message? I don't know what triggers it and thinking
> >> back, I
> >> think I have solved most of my problems with this message with a major
> >> code
> >> rewrite.
> >
> >The error means just what it says:  You are calling a function with too
> >many or too few arguments.  Why you're doing that exactly is something
> >we couldn't tell you without code examples that actually give you the
> >error.
> >
> >Only thing I can think of is that you've got a confusion with bound and
> >unbound methods; if you call an unbound method (C.f where C is a class
> >and f is a method), then you need to provide an instance of C as the
> >first method (the implicit self method becomes explicit).
>
> Or he's not calling the function that he thinks he is, possibly
> because of an "import *".
>
> (I refrained from guessing at first cuz I didn't want to leave
> anything out. Is there a natural third possibility?)
>

The problem I still hit quite often is this:

class Foo:
    def MyMethod( x, y ):
        pass


foo = Foo()
foo.MyMethod(1, 2)

Boom! Called with three args, expected two.

-Chris