On Thu, Jun 17, 2010 at 10:31 AM, Marc-Andre Lemburg <report@bugs.python.org> wrote:
..
> To avoid the wasted memory and import time, it's better to use:
>
> try:
>    from _cmodule import *
> except ImportError:
>    from _pymodule import *
>

Hmm, I cannot find the relevant thread, but I thought this was rejected at some point.  Personally, I don't like this at all for the following reasons:

1. This introduces two _.. names instead of one.

2. This departs from established convention that C (or native) implementation for modulename is in _modulename, not _cmodulename.  Non-C implementations may still provide native _modulename, but would not want to call it _cmodulename.

3. Hiding python code in _pymodule makes it harder to find it.

..
> Why not import the two modules directly ?
>
> import _cmodule as module
> and
> import _pymodule as module
>

Because this requires having two modules in the first place.