Re: Parametrized module import

From: george young (gry_at_ll.mit.edu)
Date: 07/08/04 

Date: Thu, 8 Jul 2004 10:01:21 -0400

On 08 Jul 2004 09:43:31 +0200
Jacek Generowicz <jacek.generowicz@cern.ch> threw this fish to the penguins:

> I have a module whose behaviour needs to be configurable. The module
> needs to decide, the first time it is imported, beteween alternative
> interfaces it presents.
>
> Currently, I set some environment variables which select the desired
> behaviour, and the module inspects those variables to determine the
> mode in which it should set itself up. I would prefer a pure Python
> solution, rather than one which depends on external state.
>
> Can you recommend any approaches, or warn against the pitfalls of some
> approaches?

You might look at the way pygtk does it. I haven't peeked inside, but the
api is:

import pygtk
pygtk.require('2.0') # or '1.2' or some other version
import gtk # uses state set by require() to load the appropriate version

The pygtk.py file looks quite reusable with hardly any change...

See: http://www.pygtk.org

-- George 

-- 
"Are the gods not just?"  "Oh no, child.
What would become of us if they were?" (CSL)

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