New submission from Thomas Fischbacher <tf...@google.com>:
>>> help(math.isfinite)
isfinite(x, /)
Return True if x is neither an infinity nor a NaN, and False otherwise.
So, one would expect the following expression to return `True` or `False`. We
instead observe:
>>> math.isfinite(10**1000)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
OverflowError: int too large to convert to float
(There likewise is a corresponding issue with other, similar, functions).
This especially hurts since PEP-484 states that having a Sequence[float] `xs`
does not allow us to infer that `all(issubclass(type(x), float) for x in xs)`
actually holds - since a PEP-484 "float" actually does also include "int" (and
still, issubclass(int, float) == False).
Now, strictly speaking, `help(math)` states that
DESCRIPTION
This module provides access to the mathematical functions
defined by the C standard.
...but according to "man 3 isfinite", the math.h "isfinite" is a macro and not
a function - and the man page does not show type information for that reason.
----------
messages: 416010
nosy: tfish2
priority: normal
severity: normal
status: open
title: math.isfinite() can raise exception when called on a number
_______________________________________
Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue47121>
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