Best practices for simultaneously installed versioned packages?

[Larry Hastings]

> In article 
> <ec96e1391001040816r77970e4ekca36f43b19e40a19 at mail.gmail.com>,
>  Benjamin Kaplan <benjamin.kaplan at case.edu> wrote:
>   
>> wxpython installs a "wxversion" module which has functions like
>> getInstalled(), ensureMinimal(version), and select(version). You can
>> call wxversion.select before importing wx and it will make sure that
>> the correct version is imported. You might want to look up what they
>> did.
>>     

I can imagine what they did: wxversion.select() explicitly imports the 
desired wxwindows module using __import__(), then assigns it to 
sys.modules["wxwindows"].  A good idea!


Ned Deily wrote:
> Also, setuptools (and, its successor, distribute, which supports Python 
> 3) allow the installation and management of multiple versions of a 
> package within one python site-library instance.
>   

That sounds lovely too, but I can't figure out what facility setuptools 
/ distribute permits that.  Could you be more specific?  A link to the 
documentation for this feature would be much appreciated.

Thanks,


/larry/
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