Removed PeriodArray special casing and modified test case

Author: eicchen

pandas/core/frame.py

@@ -8450,8 +8450,6 @@ def _maybe_align_series_as_frame(self, series: Series, axis: AxisInt):
         blockwise.
         """
         rvalues = series._values
-        if isinstance(rvalues, PeriodArray):
-            return series
         if not isinstance(rvalues, np.ndarray):
             if axis == 0:
                 df = DataFrame(dict.fromkeys(range(self.shape[1]), rvalues))

pandas/tests/arithmetic/test_period.py

@@ -1371,16 +1371,11 @@ def test_period_add_timestamp_raises(self, box_with_array):
         with pytest.raises(TypeError, match=msg):
             pd.Index([ts]) + arr
 
-        if box_with_array is pd.DataFrame:
-            msg = "cannot add PeriodArray and DatetimeArray"
-        else:
-            msg = r"unsupported operand type\(s\) for \+: 'Period' and 'DatetimeArray"
+        msg = "cannot add PeriodArray and DatetimeArray"
+
         with pytest.raises(TypeError, match=msg):
             arr + pd.DataFrame([ts])
-        if box_with_array is pd.DataFrame:
-            msg = "cannot add PeriodArray and DatetimeArray"
-        else:
-            msg = r"unsupported operand type\(s\) for \+: 'DatetimeArray' and 'Period'"
+
         with pytest.raises(TypeError, match=msg):
             pd.DataFrame([ts]) + arr