python-attrs / python-attrs/attrs

Use cached hash codes to short-circuit equality checks

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#502 5 comments 0 reactions 1 assignee View on GitHub

@gabbard is already working on this.

Since Feb 13, 2019.

Performance
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Python
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Description

In cases where cache_hash=True, we can short-circuit equality checks by first comparing hash codes. This can provide a very big speedup for "heavyweight" objects where field equality comparisons can be expensive (which is likely to be the case if the user bothered to enable hash caching).

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