New submission from Benjamin Peterson <benja...@python.org>:

os.dup2 currently always None. However, the underlying standard Unix function 
returns the new file descriptor (i.e., the second argument) on success. We 
should follow that convention, too.

----------
components: Extension Modules
keywords: easy
messages: 309135
nosy: benjamin.peterson
priority: low
severity: normal
stage: needs patch
status: open
title: os.dup2 should return the new fd
versions: Python 3.7

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue32441>
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