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Backport PR #62832 on branch 2.3.x (BUG: Recognize 2-tuple state without attrs dict) #63046

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Backport PR #62832 on branch 2.3.x (BUG: Recognize 2-tuple state without attrs dict) #63046

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4 changes: 4 additions & 0 deletions pandas/_libs/arrays.pyx
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Original file line number Diff line number Diff line change
Expand Up @@ -100,6 +100,10 @@ cdef class NDArrayBacked:
if len(state) == 1 and isinstance(state[0], dict):
self.__setstate__(state[0])
return
elif len(state) == 2:
# GH#62820: Handle missing attrs dict during auto-unpickling
self.__setstate__((*state, {}))
return
raise NotImplementedError(state) # pragma: no cover

data, dtype = state[:2]
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