Dennis Sweeney <[email protected]> added the comment:
PR 20718 helps somewhat by only creating and hashing the tuples that wind up in
the final set. Here's a benchmark:
-m pyperf timeit -s "d1 = {i:i for i in range(100_000)}; d2 = {i:i|1 for i in
range(100_000)}" "d1.items() ^ d2.items()"
Master: 37.9 ms +- 0.4 ms
PR 20718: 25.5 ms +- 0.4 ms
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<https://bugs.python.org/issue40889>
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