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Internally, CPython sets up its path using a single
':'-separated string.  I have no clue how, on Posix, you are
supposed to use paths containing ':' in environment variables
like $PATH - escape the colons somehow?

If there is some escape mechanism, we could support it,
both as an internal way to fix the present issue, and
directly in parsing PYTHONPATH.  If there is no such
mechanism, then I can only conclude that having colons in
paths will make many other things unhappy, not just Python.