[New-bugs-announce] [issue31879] Launcher fails on custom command starting with "python"

[Robert]

New submission from Robert <lma at posteo.de>:

In the "py.ini" file it is possible to specifiy customized commands (see https://www.python.org/dev/peps/pep-0397/#customized-commands).

Unfortunately it is not possible to specify custom commands beginning with  one of the buildin names (i.e. "python" or "/usr/bin/python"). 

This means that if I want to provide a virtual command like "python-xyz" I get an error message "Invalid version specification: '-xyz'" instead of running the executable assigned to python-xyz.

I would provide a Pullrequest if you accept this change in behaviour.

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components: Windows
messages: 305072
nosy: mrh1997, paul.moore, steve.dower, tim.golden, zach.ware
priority: normal
severity: normal
status: open
title: Launcher fails on custom command starting with "python"
type: behavior
versions: Python 2.7, Python 3.4, Python 3.5, Python 3.6, Python 3.7, Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31879>
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