[MERGE] import both c-extension and python module with the same name for testing

[Lukáš Lalinský]

On Št, 2007-08-09 at 10:55 +1000, Martin Pool wrote:
> To try and summarize the thread: there are a few choices
> 
>  1- merge something like Alexander's patch; then any module that wants
> a doubly-implemented module can just simply import it and will get
> either the C or python version
>  2- put the try/import/except/import into things that need to import it
>  3- have a pure-python wrapper module that imports whichever
> implementation is available
> 
[...]
> 
> Anything else?

Bzrlib already has two Pyrex extensions, but it is likely that there
will be more of them in the future. What about compiling them all into a
single extension (e.g. bzrlib._ext). The modules contain quite low-level
code which needs to be imported in almost all cases, anyway. I'm not
sure how big overhead have dynamic linkers on all bzr-supported
platforms, but I expect it to be bigger than for example the overhead of
try/except in case of importing the Python modules.

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