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directories on sys.path named after the package. This is useful
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argument. This feature is similar to *.pth files (see site.py),
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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
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to the copy at the end.
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specified resource.
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d = os.path.dirname(sys.modules[package].__file__)
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