Need help with Python class idioms

[Tad Marko]

Howdy!

I'm trying to get my head around Python and I've come to realize that
there are a lot of idioms in Python that are a bit different than in
other languages. I have a class similar to what I've included below.
The only difference is that in the real class, I have even more
mandatory attributes. Too many to specify at once on a constructor and
they don't always exist at construction time anyway, so the accessor
idiom must remain.

Can anyone suggest a more Pythony way to do the following?

Thanks,
Tad

#!/bin/env python

class A:
    def __init__(self):
        self.mandatoryVar1 = None
        self.mandatoryVar2 = None

    def setMV1(self, mv1):
        self.mandatoryVar1 = mv1

    def setMV2(self, mv2):
        self.mandatoryVar2 = mv2

    def saveToDB(self, db):
        if self.mandatoryVar1 == None:
            raise Exception, "Mandatory Var 1 not set."
        if self.mandatoryVar2 == None:
            raise Exception, "Mandatory Var 2 not set."

        # Using db, do whatever saving stuff is needed.