[issue34177] test_site fails in macOS-PR VSTS builds for 3.7 branch

[INADA Naoki]

INADA Naoki <songofacandy at gmail.com> added the comment:

Maybe, vsts machine installs Homebrew's Python.
Homebrew's Python installes /usr/local/lib/python3.7/sitecustomize.py

https://github.com/Homebrew/homebrew-core/blob/0ce9a5a481b3472608fe4e4188cb5d243deebb99/Formula/python.rb#L295-L329

When running tests, it is imported.
It causes test_startup_imports fail.

Maybe, we can use random prefix instead of default /usr/local to avoid this conflict.

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nosy: +inada.naoki

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