[issue27975] math.isnan(int) and math.isinf(int) should not raise OverflowError
Tim Peters
report at bugs.python.org
Tue Sep 6 14:18:24 EDT 2016
Tim Peters added the comment:
The only sane way to do things "like this" is to allow types to define their own special methods (like `__isnan__()`), in which case the math module defers to such methods when they exist. For example, this is how `math.ceil(Fraction)` works, by deferring to `Fraction.__ceil__()`. The math module itself knows nothing else about what `ceil(Fraction)` could possibly mean. All it knows is "if the type has __ceil__ use that, else convert to float first".
I'm also -1 on adding masses of if/else if/else if/.../else constructs to the math module to build in knowledge of the builtin numeric types. Do it "right" or not at all.
I'd just be -0 on adding masses of new __isnan__, __isinf__, ..., special methods. They're just not useful enough often enough.
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nosy: +tim.peters
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<http://bugs.python.org/issue27975>
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