[docs] [issue21314] Document '/' in signatures

[Berker Peksag]

Berker Peksag <berker.peksag at gmail.com> added the comment:

Welcome, Noah! Feel free to work on this issue, but please note that there is no consensus on the best place to document / signatures, so you may need to move your changes between locations (e.g. from Doc/faq/programming.rst to Doc/gloassary.rst) before we merge your work.

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versions: +Python 3.6, Python 3.7, Python 3.8 -Python 3.4, Python 3.5

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue21314>
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