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BUG: Fix Dataframe handling of scalar Timestamp #61444 #61450

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BUG: Fix Dataframe handling of scalar Timestamp #61444 #61450

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9 changes: 9 additions & 0 deletions pandas/core/frame.py
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Original file line number Diff line number Diff line change
Expand Up @@ -48,6 +48,7 @@
)
from pandas._libs.hashtable import duplicated
from pandas._libs.lib import is_range_indexer
from pandas._libs.tslibs.timestamps import Timestamp
from pandas.compat import PYPY
from pandas.compat._constants import REF_COUNT
from pandas.compat._optional import import_optional_dependency
Expand Down Expand Up @@ -4180,6 +4181,14 @@ def __setitem__(self, key, value) -> None:
):
# Column to set is duplicated
self._setitem_array([key], value)
elif (
# GH#61444
isinstance(key, Hashable)
and key in self.columns
and is_scalar(value)
and isinstance(value, (Timestamp, np.datetime64))
):
self._set_item(key, [value] * len(self))
else:
# set column
self._set_item(key, value)
Expand Down
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