[issue11827] mention of list2cmdline() in docs of subprocess.Popen

[Ezio Melotti]

Ezio Melotti <ezio.melotti at gmail.com> added the comment:

If a _ is added to list2cmdline the old name should be kept and deprecated.
The function is also on 2.x and it's not deprecated there (and it's probably too late to deprecate it now), so we might have to wait a few versions before it will be possible to remove list2cmdline from 3.x.

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nosy: +ezio.melotti

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