Allow inheritance of Venvs

[Carreau]

BPO	42101
Nosy	@Carreau
PRs	bpo-42101: allow inheritance of venv #23504

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2020-10-20.21:18:09.031>
labels = ['type-feature', '3.10']
title = 'Allow inheritance of Venvs'
updated_at = <Date 2020-11-25.02:00:03.340>
user = 'https://github.com/Carreau'

bugs.python.org fields:

activity = <Date 2020-11-25.02:00:03.340>
actor = 'mbussonn'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = []
creation = <Date 2020-10-20.21:18:09.031>
creator = 'mbussonn'
dependencies = []
files = []
hgrepos = []
issue_num = 42101
keywords = ['patch']
message_count = 1.0
messages = ['379164']
nosy_count = 1.0
nosy_names = ['mbussonn']
pr_nums = ['23504']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue42101'
versions = ['Python 3.10']

[Carreau]

Followup from Python Idea:

https://mail.python.org/archives/list/python-ideas@python.org/thread/KTIYUEYF6XBHOGOLV744RQXMTETVSTOF/

Goal would be to allow layering on virtualenv to speedup creation and use less disk space in the case of many large venv having the same base.

This would be based on an private internal patch that would be upstreamed.

[ncoghlan]

Note that even without native interpreter support, environment layering can be supported via a sitecustomize.py file in the inheriting environments.