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In the effort of making the UX better with vendored Python versions, I think it would make sense to track and expose vendor information.
Initially, the vendor information would be comprised of two fields, the vendor string (eg. `Debian`) and the vendor name (eg. `debian`).
If specified, it would change the interpreter/installation in the following ways:
 - The vendor string would be shown in places like the IDLE shell (eg. [1])
 - The vendor name would be added to the installation paths (/usr/lib/python3.9 would become /usr/lib/python3.9-debian)
 - This would include scripts, so the interpreter would be called python3-debian, the vendors can then rename or symlink it to python3 if they want to have that be the default Python on the system
Additionally, I think we should add two new functions to the platform module, platform.vendor() and platform.vendor_name().
Overall, I think this would help out users identify the Python installation and avoid clashes between Python installations, even allowing parallel installations.
If I remember everything correctly, this should fix Matthias issues with bpo-43976. Matthias, could you confirm?
Any thoughts?
[1] new IDLE shell output
Debian Python 3.9.6 (default, Jun 30 2021, 10:22:16)
[GCC 11.1.0] on linux
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