[py-dev] How best to notify modules?

[Maciek Fijalkowski]

Michael Hipp wrote:
> What's the best technique for this?
>
> My current project uses lots of timestamps ( i.e now(), today() ) but this 
> causes lots of things to return different results with every run. So for the 
> cases where the module under test needs to return results that are binary 
> repeatable with every run, I want to centralize all my calls to the above 
> functions in one place and have them return a predetermined value when under test.
>
> So how best to communicate to a module that it is under test and a few certain 
> things need to modify their behavior slightly?
>
> Just looking for "best practices" here.
>
> Thanks,
> Michael
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>   
I would go for

import foo

def setup_module(mod):
   try:
       old_now = foo.now
       foo.now = a_day
       ....
   finally:
       foo.now = old_now