[issue26167] Improve copy.copy speed for built-in types (list/set/dict)

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

> This looks nicer and should run faster by taking advantage of the LIST_APPEND opcode.

The difference is insignificantly (less than 1%) for large lists (list(range(10000))), but it is 3-4% slower for small lists (list(range(10))) and 20-25% slower for empty lists.

On 2.7 your code always has advantage, but on 3.x seems it doesn't have any advantage (thanks to overhead of using a generator).

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue26167>
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