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#15438: add a note to math.pow() that suggests using **/pow() for integers. Patch by Mark Dickinson.

This commit is contained in:
Ezio Melotti 2013-02-23 04:53:44 +02:00
parent 43b09d49b6
commit 6a959a1213
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Doc/library/math.rst
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@ -212,6 +212,10 @@ Power and logarithmic functions
``x`` is negative, and ``y`` is not an integer then ``pow(x, y)`` ``x`` is negative, and ``y`` is not an integer then ``pow(x, y)``
is undefined, and raises :exc:`ValueError`. is undefined, and raises :exc:`ValueError`.
Unlike the built-in ``**`` operator, :func:`math.pow` converts both
its arguments to type :class:`float`. Use ``**`` or the built-in
:func:`pow` function for computing exact integer powers.
.. versionchanged:: 2.6 .. versionchanged:: 2.6
The outcome of ``1**nan`` and ``nan**0`` was undefined. The outcome of ``1**nan`` and ``nan**0`` was undefined.