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From: Ned Batchelder <ned@nedbatchelder.com>
Subject: Re: where to put global testing value
Date: Tue, 29 Apr 2014 12:32:35 -0400
References: <535FD086.7000003@chamonix.reportlab.co.uk>
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On 4/29/14 12:17 PM, Robin Becker wrote:
> A user complains that under AppEngine I'm not allowed to import __main__.
>
> I can fix this issue merely by putting a try block around the offending
> import which is only used like this
>
>
> import __main__
> testing = getattr(__main__,'_rl_testing',False)
> del __main__
>
> this is only used as a hack way, during testing, to modify the behaviour
> of the importing module (a proxy for a C extension). During testing we
> keep both the C version and the supposed replacement of various
> functions so they can be tested against each other
>
> https://bitbucket.org/rptlab/reportlab/src/default/src/reportlab/lib/rl_accel.py
>
>
> Is there a more reasonable way to allow changes to module level globals
> before the import takes place? I guess since this module is supposed
> only to be imported by reportlab we can put this sort of thing onto the
> reportlab module itself, but that could possibly lead to import loops.
>
> Any ideas?

In coverage.py, I used environment variables to control that kind of 
behavior.

-- 
Ned Batchelder, http://nedbatchelder.com