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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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modified; an extended copy is returned. Items are only appended
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specified resource.
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The first form is intended for backward compatibility only. It assumes that
some part of the dotted name is a package, and the rest is an object
somewhere within that package, possibly nested inside other objects.
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can't be inferred by inspection, repeated attempts to import must be done
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
it ends with the colon, then a module object is returned.
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