[issue8640] subprocess: add envb argument to Popen constructor (Python3, POSIX only)

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

> Why wouldn't you give byte variables in env too?

The problem with the canonicalization to bytes is to choice of the preferred type. Eg. env={'PATH': 'a', b'PATH': b'b'}: should we use 'a', 'b' or raise an error?

subprocess does already convert environ keys and values to bytes on Unix (in subprocess._execute_child() if _posixsubprocess module is present, and in posix_execve()).

os.get_exec_path() should also support b'PATH' key.

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