[issue9685] tuples should remember their hash value

[Tim Peters]

Tim Peters <tim.peters at gmail.com> added the comment:

- Tuple objects don't currently reserve space to store their hash code, so it's likely this would increase the size of every tuple.

- It's unclear to me which natural use patterns would actually enjoy a major speed boost.  Note that dicts remember the hash codes of keys already, regardless of whether the key type remembers them too.  A tuple is typically constructed right before being used in a dict lookup, so for a one-shot use no time would be saved.  If the new tuple is used in multiple dict lookups, sure - but is that common?

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nosy: +tim_one

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue9685>
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