[Python-3000] Should package __init__ files include pkgutil.extend_path?

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I'm trying to figure out how to install this dbm.sqlite module I have
without overwriting the basic install.  My thought was to create a dbm
package in site-packages then copy sqlite.py there.  That doesn't work
though.  Modifying dbm.__init__.py to include this does:

    import pkgutil
    __path__ = pkgutil.extend_path(__path__, __name__)

I'm wondering if all the core packages in 3.x should include the above in
their __init__.py files.

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