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directories on sys.path named after the package. This is useful
if one wants to distribute different parts of a single logical
package as multiple directories.
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argument. This feature is similar to *.pth files (see site.py),
except that it doesn't special-case lines starting with 'import'.
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duplicates, all entries found in a *.pkg file are added to the
path, regardless of whether they are exist the filesystem. (This
is a feature.)
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packages) it is returned unchanged. The input path is not
modified; an extended copy is returned. Items are only appended
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is not allowed, and nor is a rooted name (starting with a '/').
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specified resource.
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d = os.path.dirname(sys.modules[package].__file__)
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