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Fri Mar 5 17:16:00 EST 2010 · http://mail.python.org/pipermail/python-list/2010-March/720892.html

On 3/5/2010 4:29 PM, Pete Emerson wrote:
> On Mar 5, 1:14 pm, Chris Rebert<c... at rebertia.com>  wrote:

> I want to write other modules, and my thinking is that it makes sense
> for those modules to use the "logger" module to do the logging, if and
> only if the parent using the other modules is also using the logger
> module.
>
> In other words, I don't want to force someone to use the "logger"
> module just so they can use my other modules, even if the "logger"
> module is installed ... but I also want to take advantage of it if I'm
> using it.
>
> Now that I've written that, I'm not sure that makes a whole lot of
> sense. It seems like I could say, "hey, this person has the 'logger'
> module available, let's use it!".

Except in unusual cases, where merely importing a modules uses 
substantial resources, I would say that if it is available, use it.

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Conditional based on whether or not a module is being used