The error message for unsupported index on shift() could be more explicit (#38176)

* Update base.py

* Update base.py

* Update base.py

* Update base.py

* Update common.py

* Update common.py

* Update common.py

* Update test_analytics.py

* Update base.py

* Update base.py

* Update common.py

* Update test_analytics.py

* Update base.py

* Update common.py

* Update common.py

* Update common.py

Author: ZhihuiChen0903

pandas/core/indexes/base.py

@@ -4735,7 +4735,10 @@ def shift(self, periods=1, freq=None):
                        '2012-03-01'],
                       dtype='datetime64[ns]', freq='MS')
         """
-        raise NotImplementedError(f"Not supported for type {type(self).__name__}")
+        raise NotImplementedError(
+            f"This method is only implemented for DatetimeIndex, PeriodIndex and "
+            f"TimedeltaIndex; Got type {type(self).__name__}"
+        )
 
     def argsort(self, *args, **kwargs) -> np.ndarray:
         """

pandas/tests/indexes/common.py

@@ -73,7 +73,10 @@ def test_shift(self):
 
         # GH8083 test the base class for shift
         idx = self.create_index()
-        msg = f"Not supported for type {type(idx).__name__}"
+        msg = (
+            f"This method is only implemented for DatetimeIndex, PeriodIndex and "
+            f"TimedeltaIndex; Got type {type(idx).__name__}"
+        )
         with pytest.raises(NotImplementedError, match=msg):
             idx.shift(1)
         with pytest.raises(NotImplementedError, match=msg):

pandas/tests/indexes/multi/test_analytics.py

@@ -11,7 +11,8 @@
 def test_shift(idx):
 
     # GH8083 test the base class for shift
-    msg = "Not supported for type MultiIndex"
+    msg = "This method is only implemented for DatetimeIndex, PeriodIndex and "
+    "TimedeltaIndex; Got type MultiIndex"
     with pytest.raises(NotImplementedError, match=msg):
         idx.shift(1)
     with pytest.raises(NotImplementedError, match=msg):