Conditional based on whether or not a module is being used

[Chris Rebert]

On Fri, Mar 5, 2010 at 12:25 PM, Pete Emerson <pemerson at gmail.com> wrote:
> On Fri, Mar 5, 2010 at 12:17 PM, Chris Rebert <clp2 at rebertia.com> wrote:
>> On 3/5/10, Pete Emerson <pemerson at gmail.com> wrote:
>>> In a module, how do I create a conditional that will do something
>>> based on whether or not another module has been loaded?
<snip>
>>> If someone is using foo module, I want to take advantage of its
>>> features and use it in foobar, otherwise, I want to do something else.
>>> In other words, I don't want to create a dependency of foobar on foo.
>>>
>>> My failed search for solving this makes me wonder if I'm approaching
>>> this all wrong.
>>
>> Just try importing foo, and then catch the exception if it's not installed.
<snip>
> Except I want to use the module only if the main program is using it
> too, not just if it's available for use. I think that I found a way in
> my follow-up post to my own message, but not sure it's the best way or
> conventional.

What is your use case for this behavior exactly? You've piqued my curiosity.

Cheers,
Chris
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