Serhiy Storchaka added the comment:
Unfortunately a link to Rietveld is not available for review and inlined
comments.
In sample() the selected set can be initialized to {n} to avoid additional
checks in the loop for large population. In the branch for small population,
non-empty pool can be extended ("pool.append(pool[-1])") to avoid additional
check in the loop.
In choice() I would write the condition as "i == n > 0" to avoid indexing with
negative index. Custom collection can has non-standard behavior with negative
indices. This doesn't add additional cost in normal case.
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<http://bugs.python.org/issue24567>
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