GH1095 Add list of string to to_timedelta

Author: loicdiridollou

pandas-stubs/core/tools/timedeltas.pyi

@@ -33,7 +33,7 @@ def to_timedelta(
 def to_timedelta(
     arg: (
         SequenceNotStr
-        | Sequence[float | timedelta]
+        | Sequence[float | timedelta | str]
         | tuple[str | float | timedelta, ...]
         | range
         | ArrayLike

tests/test_timefuncs.py

@@ -1425,3 +1425,10 @@ def test_DatetimeIndex_sub_timedelta() -> None:
         ),
         pd.DatetimeIndex,
     )
+
+
+def test_datetimeindex_as_unit() -> None:
+    """Test that we can pass a list of str for `to_timedelta` GH1095."""
+    tdelta_idx = pd.to_timedelta(["1 day 3 min 2 us 42 ns"])
+    check(assert_type(tdelta_idx, pd.TimedeltaIndex), pd.TimedeltaIndex)
+    check(assert_type(tdelta_idx.as_unit("s"), pd.TimedeltaIndex), pd.TimedeltaIndex)