Using python to extend a python app

[dataangel]

I'm writing a python app that works as a replacement for the menu that 
comes with most minimalist wms when you right click the root window. 
It's prettier and written completely in python.

I'd like to provide hooks or some system so that people can write their 
own extensions to the app, for example adding fluxbox options, and then 
fluxbox users can choose to use that extension. But I'm not sure how to 
implement it.

Right now the best idea I have is to have all desired extensions in a 
folder, import each .py file in that folder as a module using 
__import__, and then call some predetermined method, say start, and 
pass it the menu as it exists so far so they can add to it, start(menu). 
This seems kind of hackish.

I looked at how gdesklets handles this, but its solution looks way more 
complex than I'd prefer to have to dive into for this tiny app.

What's the most pythonic way to do this? How do apps that extend 
themselves with python usually do this?
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Re: Using python to extend a python app

[David M. Cooke]

dataangel [EMAIL PROTECTED] writes:

 I'm writing a python app that works as a replacement for the menu that
 comes with most minimalist wms when you right click the root window.
 It's prettier and written completely in python.

 I'd like to provide hooks or some system so that people can write
 their own extensions to the app, for example adding fluxbox options,
 and then fluxbox users can choose to use that extension. But I'm not
 sure how to implement it.

 Right now the best idea I have is to have all desired extensions in a
 folder, import each .py file in that folder as a module using
 __import__, and then call some predetermined method, say start, and
 pass it the menu as it exists so far so they can add to it,
 start(menu). This seems kind of hackish.

That looks pretty reasonable, and easy. There have been some recent
threads (in the past month or so) on plugins, so you might want to
search the archives. Most of it's revolved around not using exec :-)

I just had a look at pyblosxom (one program that I know that uses
plugins), and it uses exactly this approach, with some extra frills:
looking in subdirectories, for instance.

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|David M. Cooke
|cookedm(at)physics(dot)mcmaster(dot)ca
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