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

[M.-A. Lemburg]

On 2008-09-06 23:06, skip at pobox.com wrote:
> 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.

If all you want to do is get the module into the dbm package, why not
make this explicit by requiring an import to install the extra module ?!

import install_dbm_sqlite

which then does:

import sys, dbm
import dbm_sqlite

# Install dbm_sqlite into the dbm package
sys.modules['dbm.sqlite'] = dbm_sqlite
dbm.sqlite = dbm_sqlite

Unlike pkgutil, this also works with ZIP files and frozen modules
and makes the installation explicit and visible to the user reading
your code.

-- 
Marc-Andre Lemburg
eGenix.com

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