[issue27739] add math.sign/signum

[Ankur Dedania]

New submission from Ankur Dedania:

Add a new function to the math module sign/signum https://en.wikipedia.org/wiki/Sign_function

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messages: 272459
nosy: AnkurDedania
priority: normal
severity: normal
status: open
title: add math.sign/signum
type: enhancement
versions: Python 3.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27739>
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