Avoiding if..elsif statements

[Tal Einat]

Fredrik Lundh wrote:
> "unexpected" <sumesh.chopra at gmail.com> wrote:
>
> > However, I'm passing in a few variables, so I can't just take it
> > out-though every single function would be passing the same variables.
> >
> > so something.func() is actually
> > something.func(string, list)
> >
> > How would I modify it to include them?
>
> just add the parameters to the call:
>
>     dispatch[value](string, list) # note: do the call here!
>

This will work great if all of your functions recieve the same
argument(s). If not, there are still simple solutions.

I would suggest a solution like this, since it's simple and generic:

class Command (object):
    def __init__(self, func, *args, **kw):
        self.func = func
        self.args = args
        self.kw = kw
    def __call__(self, *args, **kw):
        args = self.args+args
        kw.update(self.kw)
        apply(self.func, args, kw)

An instance of the Command class can be called just like a function,
and it will call the orginial function with the arguments it was
instantiated with. (You can also pass additional arguments at the call
itself)

dispatch = {
       "something": Command(somethingClass.func),
       "somethingElse": Command(somethingElseClass.func, "moo",
[1,2,3]),
       "anotherthing": Command(anotherthingClass.func, 'a', 'b', 'c'),
       "yetanotherthing": Command(yetanotherthingClass.func,
verbose=True),
    }

dispatch[value]()

- Tal Einat
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