BUG GH23451 Allow setting date in string index for Series (pandas-dev#23495)

Author: JustinZhengBC

doc/source/whatsnew/v0.24.0.txt

@@ -1118,6 +1118,7 @@ Datetimelike
 - Bug in :func:`DataFrame.combine` with datetimelike values raising a TypeError (:issue:`23079`)
 - Bug in :func:`date_range` with frequency of ``Day`` or higher where dates sufficiently far in the future could wrap around to the past instead of raising ``OutOfBoundsDatetime`` (:issue:`14187`)
 - Bug in :class:`PeriodIndex` with attribute ``freq.n`` greater than 1 where adding a :class:`DateOffset` object would return incorrect results (:issue:`23215`)
+- Bug in :class:`Series` that interpreted string indices as lists of characters when setting datetimelike values (:issue:`23451`)
 
 Timedelta
 ^^^^^^^^^

pandas/core/series.py

@@ -947,7 +947,9 @@ def _set_with(self, key, value):
  except Exception:
  pass
 
- if not isinstance(key, (list, Series, np.ndarray, Series)):
+ if is_scalar(key):
+ key = [key]
+ elif not isinstance(key, (list, Series, np.ndarray)):
  try:
  key = list(key)
  except Exception:

pandas/tests/series/test_datetime_values.py

@@ -548,3 +548,10 @@ def test_minmax_nat_series(self, nat):
  def test_minmax_nat_dataframe(self, nat):
  assert nat.min()[0] is pd.NaT
  assert nat.max()[0] is pd.NaT
+
+ def test_setitem_with_string_index(self):
+ # GH 23451
+ x = pd.Series([1, 2, 3], index=['Date', 'b', 'other'])
+ x['Date'] = date.today()
+ assert x.Date == date.today()
+ assert x['Date'] == date.today()