[issue38382] statistics.harmonic_mean fails to raise error with negative input that follows a 0

[Raymond Hettinger]

Change by Raymond Hettinger <raymond.hettinger at gmail.com>:


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assignee:  -> rhettinger
nosy: +rhettinger, steven.daprano
versions: +Python 3.7, Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38382>
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