Thanks everyone for the advice.
Bernard
On 11/9/06, Danny Yoo <[EMAIL PROTECTED]> wrote:
> >> Say I have class A:
> >>
> >> class A:
> >> def myMethod( self ):
> >> print 'foo'
> >>
> >> a = A()
> >
> > getattr(a, 'myMethod')()
> >
> > The getattr() call gets the bound method, the extra parentheses at the
> > end call it.
>
>
> Hi Bernard,
>
> You can also do this in a controlled manner by treating the methods as
> functions, and using a dispatch table. Concretely:
>
> #########################################################
> class TestDispatch:
> def add(self, x, y):
> return x + y
>
> def sub(self, x, y):
> return x - y
>
> def dontcallme(self):
> return "oh no"
>
> def dispatch(self, msg, *args):
> table = {"add" : self.add,
> "sub" : self.sub}
> if msg in table:
> return table[msg](*args)
> print "Unrecognized message:", msg
> return None
>
> def test():
> calc = TestDispatch()
> msg = None
> while msg != 'quit':
> msg = raw_input('cmd? ')
> print calc.dispatch(msg, 3, 4)
> #########################################################
>
> Try running test(), and then enter either "add" or "sub" at the prompt.
>
> This approach differs from getattr() because we can prevent clients from
> calling dontcallme() by excluding it from our dispatch table, so it's more
> controlled. Also, it's a techinque that's pretty programming-language
> agnostic. However, it is a little more verbose than the equivalent
> getattr()-driven code.
>
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