[issue30994] Asyncore does not need to copy map.items() before polling

[STINNER Victor]

STINNER Victor added the comment:

asyncore is now deprecated and I prefer to restrict changes to minimum to avoid regressions. While the change makes sense, it only looks like a very cheap micro-optimization. I don't think that it's worth it.

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<http://bugs.python.org/issue30994>
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