[3.13] gh-129967: Fix race condition in repr(set) (gh-129978)
#130020
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…29978) The call to `PySequence_List()` could temporarily unlock and relock the set, allowing the items to be cleared and return the incorrect notation `{}` for a empty set (it should be `set()`). (cherry picked from commit a7427f2) Co-authored-by: Sam Gross <colesbury@gmail.com> Co-authored-by: T. Wouters <thomas@python.org>
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The call to
PySequence_List()could temporarily unlock and relock the set, allowing the items to be cleared and return the incorrect notation{}for a empty set (it should beset()).(cherry picked from commit a7427f2)
clearcauses concurrent__str__to print as empty dict #129967