* Try to match the module name pattern with module names constructed
starting from different parent directories of the filename.
E.g., for "/path/to/package/module" try to match with
"path.to.package.module", "to.package.module", "package.module" and
"module".
* Ignore trailing "/__init__.py".
* Ignore trailing ".pyw" on Windows.
* Keep matching with the full filename (without optional ".py" extension)
for compatibility.
* Only ignore the case of the ".py" extension on Windows.
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