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bpo-38382: Document the early-out behavior for a zero (GH-17037)

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Raymond Hettinger 2019-11-06 21:50:44 -08:00 committed by GitHub
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Doc/library/statistics.rst
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@ -164,7 +164,8 @@ However, for reading convenience, most of the examples show sorted sequences.
The harmonic mean, sometimes called the subcontrary mean, is the The harmonic mean, sometimes called the subcontrary mean, is the
reciprocal of the arithmetic :func:`mean` of the reciprocals of the reciprocal of the arithmetic :func:`mean` of the reciprocals of the
data. For example, the harmonic mean of three values *a*, *b* and *c* data. For example, the harmonic mean of three values *a*, *b* and *c*
will be equivalent to ``3/(1/a + 1/b + 1/c)``. will be equivalent to ``3/(1/a + 1/b + 1/c)``. If one of the values
is zero, the result will be zero.
The harmonic mean is a type of average, a measure of the central The harmonic mean is a type of average, a measure of the central
location of the data. It is often appropriate when averaging location of the data. It is often appropriate when averaging
@ -190,6 +191,10 @@ However, for reading convenience, most of the examples show sorted sequences.
:exc:`StatisticsError` is raised if *data* is empty, or any element :exc:`StatisticsError` is raised if *data* is empty, or any element
is less than zero. is less than zero.
The current algorithm has an early-out when it encounters a zero
in the input. This means that the subsequent inputs are not tested
for validity. (This behavior may change in the future.)
.. versionadded:: 3.6 .. versionadded:: 3.6