Antoine Pitrou <pit...@free.fr> added the comment:

There aren't many possible approaches. The more complex variants of globals 
caches try to also speedup writes, which is IMO a waste of time since rebinding 
globals is not a good coding practice, and especially not in the middle of 
time-critical loops.

(by the way, the patch only addresses normal functions, but generators would 
easily benefit from a similar treatment)

And Skip is right that this would be most useful when paired with a JIT 
(allowing for aggressive specialization, and possibly inlining).

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<http://bugs.python.org/issue10401>
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