[issue37089] `import Lib.os` works on windows (but shouldn't)

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

If .../Tools and its subdirectories had __init__.py files, the presence of sys.prefix on sys.path, on Windows, would allow imports from those subdirs.  Otherwise, it only provides a second way to import stdlib modules.  This seems like a bit of a bug.  Guido, do you remember why we have this Windows-only feature?

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nosy: +gvanrossum, terry.reedy

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