Nick Coghlan added the comment:
Work in progress PR at https://github.com/python/cpython/pull/571
I also came up with a reasonably straightforward way of defining the desired
"sys.path" initialisation behaviour, which is that the following should all get
the *same* sys.path entries:
python3 -S script_dir/__main__.py
python3 -S script_dir
python3 -I script_dir
None of those should have the current directory on sys.path, but they should
*all* have `script_dir` as the first entry on sys.path (and it will be absolute
by the time user code runs, even though RunMainAsImporter itself doesn't yet
ensure that).
They all differ from the `python3 -m script_dir` and `python3 -m
script_dir.__main__` cases, as those are the exact opposite: they *should* have
the current directory as the first entry on sys.path and *should not* have
`script_dir` in sys.path at all.
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<http://bugs.python.org/issue29723>
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