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Nested lock in set.issuperset #159486
Description
When calling set is set_issuperset_impl() is already locked but calls set_issubset which
just wraps a lock to set_issubset_impl
Fixing it is very minimal, there is already a non lock very of set_is_subset, leading to just under 2x speedup on macos on free-threading
$ ./python -m timeit -s "a = set('abcdefgh'); b = set('abcd')" "a >= b"
before: 10000000 loops, best of 5: 35.4 nsec per loop
after: 20000000 loops, best of 5: 18.5 nsec per loop
$ ./python -m timeit -s "a = set('abcdefgh'); b = set('abcd')" "a.issuperset(b)"
before: 10000000 loops, best of 5: 38.7 nsec per loop
after: 10000000 loops, best of 5: 20.2 nsec per loop
Activity
johng commented on Oct 16, 2026
#159558