fix namespace usage

Author: TiffL

pandas/core/indexes/base.py

@@ -6209,10 +6209,10 @@ def _maybe_downcast_for_indexing(self, other: Index) -> tuple[Index, Index]:
                 # let's instead try with a straight Index
                 self = Index(self._values)
 
-        elif self.inferred_type == 'string' and isinstance(other, ABCPeriodIndex):
+        elif self.inferred_type == "string" and isinstance(other, ABCPeriodIndex):
             try:
                 return self.astype(other.dtype), other
-            except:
+            except (TypeError, ValueError):
                 return self, other
 
         if not is_object_dtype(self.dtype) and is_object_dtype(other.dtype):

pandas/tests/indexes/period/test_setops.py

@@ -316,15 +316,15 @@ def test_difference(self, sort):
 
     def test_difference_mismatched_dtypes(self, sort):
         # GH58971
-        index = period_range('2022-01-01', periods=5, freq='M')
-        other = Index(['2022-02', '2022-03'])
+        index = period_range("2022-01-01", periods=5, freq="M")
+        other = pd.Index(["2022-02", "2022-03"])
 
         idx_diff = index.difference(other, sort)
-        expected = PeriodIndex(['2022-01', '2022-04', '2022-05'], freq='M')
+        expected = PeriodIndex(["2022-01", "2022-04", "2022-05"], freq="M")
         tm.assert_index_equal(idx_diff, expected)
 
         idx_diff = other.difference(index, sort)
-        expected = Index([])
+        expected = pd.Index([])
         tm.assert_index_equal(idx_diff, expected)
 
     def test_difference_freq(self, sort):