[issue35328] Set a environment variable for venv prompt

[Mathias Fredriksson]

Change by Mathias Fredriksson <mafredri at gmail.com>:


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pull_requests: +21368
pull_request: https://github.com/python/cpython/pull/22324

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35328>
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