[issue23185] add inf and nan to math module

[Mark Dickinson]

Mark Dickinson added the comment:

Implementation suggestion: if possible, use the _Py_dg_stdnan and _Py_dg_infinity functions from Python/dtoa.c.  These are a little safer than the Py_NAN and Py_HUGE_VAL macros, and will give results consistent with the float("inf") and float("nan") constructions.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue23185>
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