Antony Lee <[email protected]> added the comment:
There are a number of packages that can "self-import" into any Python process
depending on the presence of an environment variable, by installing a pth file
that contains something like `import os; __import__("thepkg") if
os.environ.get("THEENVVAR") else None`. Examples include colorization of
logging output
(https://coloredlogs.readthedocs.io/en/latest/api.html#environment-variables)
or installation of a trace function
(https://pypi.org/project/hunter/#environment-variable-activation).
If the pth mechanism goes away, a preload system should definitely be present
to provide a replacement; it should again support multiple packages each
installing their own hook.
----------
nosy: +Antony.Lee
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<https://bugs.python.org/issue33944>
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