> Testing for inclusion in a set of types is a little less
> straightforward if you are concerned about possible subclassing.
> Currently, to see if an object is a number you would write
>
> if type(o) in (IntType, FloatType, ComplexType):
> ...
>
> That would be converted to
>
> if type(o) in (int, float, complex):
> ...
>
> or
>
> if (isinstance(o, int) or isinstance(o, float) or
> isinstance(o, complex)):
> ...
>
> The last case is decidedly cumbersome.
>
or
if isinstance(o, (int, float, complex)):
Thomas
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