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BUG: Fix unpickling of string dtypes of legacy pandas versions #61770

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Merged
merged 9 commits into from
Jul 7, 2025
Merged

BUG: Fix unpickling of string dtypes of legacy pandas versions #61770

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7eec271
Fix StringDtype compat with old pickles
Liam3851 Jul 3, 2025
cbf1eae
Add pandas string dtypes to legacy pickle tests.
Liam3851 Jul 3, 2025
184e55c
Remove stray diff.
Liam3851 Jul 3, 2025
3b8e6ae
Fix formatting.
Liam3851 Jul 3, 2025
430dd44
Add type hint to setstate.
Liam3851 Jul 3, 2025
3d612b2
Import MutableMapping
Liam3851 Jul 3, 2025
2331ffd
Add pickle tests for the latest bugfix of each minor 2.x version.
Liam3851 Jul 5, 2025
3fbbd94
Add explanatory comment and whatsnew entry.
Liam3851 Jul 5, 2025
227741b
Replace 2.2.3 pickle with a version created without numpy 2 installed.
Liam3851 Jul 6, 2025
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Import MutableMapping
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@Liam3851
Liam3851 committed Jul 3, 2025
commit 3d612b2aedf3df18b87ae92508147d11bc2a0af7
2 changes: 2 additions & 0 deletions pandas/core/arrays/string_.py
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Expand Up @@ -72,6 +72,8 @@
from pandas.io.formats import printing

if TYPE_CHECKING:
from collections.abc import MutableMapping

import pyarrow

from pandas._typing import (
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