Michał Fronczyk added the comment:
A link to my stackoverflow question with further rationale -
https://stackoverflow.com/questions/58122752/provide-additional-location-of-site-packages-to-python?noredirect=1#comment102637846_58122752
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Python
New submission from Michał Fronczyk :
An environment variable to point to an additional site-packages directory
(without disabling the one in Python itself) location would allow having
different sets of extra packages that can be enabled by the users in their or
shared Python installations
