Thanks everyone; it has been very educational.
> Dave Angel:
> ...we'll find that two of the alternatives are not even equivalent.
That helped me realize (a,b) != (None, None) is not correct for the function.
It's a case where two parameters have None as the default argument. What I want
is to
> Do you actually want to check for arbitrary objects which may claim to
> equal None, or do you want to check for objects which are None?
Arbitrary objects are not a concern.
> if not (a is b is None): ...
>
> if a is not b is not None: ...
Thanks for the examples.
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if (a, b) != (None, None):
or
if a != None != b:
Preference? Pros? Cons? Alternatives?
:D
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