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Apr 2, 2022
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bpo-47031: Improve documentation for math.nan #32170

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a8006a7
Improve documentation for `math.nan`
CharlieZhao95 Mar 28, 2022
98275bd
Update Doc/library/math.rst
CharlieZhao95 Mar 29, 2022
cd3af79
Update Doc/library/math.rst
CharlieZhao95 Mar 29, 2022
cb51d82
remove examples related to `is`
CharlieZhao95 Mar 29, 2022
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19 changes: 17 additions & 2 deletions Doc/library/math.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -646,8 +646,23 @@ Constants

.. data:: nan

A floating-point "not a number" (NaN) value. Equivalent to the output of
``float('nan')``.
A floating-point "not a number" (NaN) value. Equivalent to the output of
``float('nan')``. Due to the requirements of the `IEEE-754 standard
<https://en.wikipedia.org/wiki/IEEE_754>`_, ``math.nan`` and ``float('nan')`` are
not considered to equal to any other numeric value, including themselves. To check
whether a number is a NaN, use the :func:`isnan` function to test
for NaNs instead of ``is`` or ``==``.
Example::

>>> import math
>>> math.nan == math.nan
False
>>> float('nan') == float('nan')
False
>>> math.isnan(math.nan)
True
>>> math.isnan(float('nan'))
True

.. versionchanged:: 3.11
It is now always available.
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