Class instantiation question

[Todd Johnson]

Ok, say I have a class MyClass and an __init__(self,
a, b)  Say that a and b are required to be integers
for example. So my init looks like:

__init__(self, a, b):
    try:
        self.one = int(a)
        self.two = int(b)
    except ValueError:
        #nice error message here
        return None

I have even tried a similar example with if-else
instead of try-except, but no matter what if I call

thisInstance = MyClass(3, "somestring")

it will set self.one to 3 and self.two will be
uninitialised. The behavior I am hoping for, is that
thisInstance is not created instead(or is None). How
do I get the behavior I am looking for?

Thanks in advance,
Todd

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