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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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path, regardless of whether they are exist the filesystem. (This
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packages) it is returned unchanged. The input path is not
modified; an extended copy is returned. Items are only appended
to the copy at the end.
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with this form.
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provision of a single colon: the dotted name to the left of the colon is a
package to be imported, and the dotted name to the right is the object
hierarchy within that package. Only one import is needed in this form. If
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