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Subject: Re: subtle error slows code by 10x (builtin sum()) - replace builtin sum without using import?
From: Albert Hopkins <marduk@letterboxes.org>
To: python-list@python.org
Date: Fri, 01 Jul 2011 22:54:10 -0400
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On Friday, July 1 at 19:17 (-0700), bdb112 said:

> Question:
> Can I replace the builtin sum function globally for test purposes so
> that my large set of codes uses the replacement?
> 
> The replacement would simply issue warnings.warn() if it detected an
> ndarray argument, then call the original sum
> I could then find the offending code and use the appropriate import to
> get numpy.sum

You shouldn't do this, but you could use the __builtins__ module

e.g.

>>> __builtins__.sum = numpy.sum # bad