Revert "remove comments)"

This reverts commit 08a5f3e.

pandas/core/generic.py

@@ -10184,6 +10184,43 @@ def mad(self, axis=None, skipna=None, level=None):
             _min_examples,
         )
 
+    # @classmethod
+    # def _add_series_only_operations(cls):
+    #     """
+    #     Add the series only operations to the cls; evaluate the doc
+    #     strings again.
+    #     """
+
+    #     axis_descr, name, name2 = _doc_parms(cls)
+
+    #     def nanptp(values, axis=0, skipna=True):
+    #         nmax = nanops.nanmax(values, axis, skipna)
+    #         nmin = nanops.nanmin(values, axis, skipna)
+    #         warnings.warn(
+    #             "Method .ptp is deprecated and will be removed "
+    #             "in a future version. Use numpy.ptp instead."
+    #             "if you are already using numpy.ptp and still getting this message,"
+    #             "please call to_numpy() to avoid this message in future calls."
+    #             "For example: np.ptp(pd.Series([1, 2, 3]).to_numpy())",
+    #             FutureWarning,
+    #             stacklevel=4,
+    #         )
+    #         return nmax - nmin
+
+    #     cls.ptp = _make_stat_function(
+    #         cls,
+    #         "ptp",
+    #         name,
+    #         name2,
+    #         axis_descr,
+    #         """Return the difference between the min and max value.
+    #         \n.. deprecated:: 0.24.0 Use numpy.ptp instead
+    #         \nReturn the difference between the maximum value and the
+    #         minimum value in the object. This is the equivalent of the
+    #         ``numpy.ndarray`` method ``ptp``.""",
+    #         nanptp,
+    #     )
+
     @classmethod
     def _add_series_or_dataframe_operations(cls):
         """

pandas/core/series.py

@@ -4390,6 +4390,7 @@ def to_period(self, freq=None, copy=True):
     ["index"], docs={"index": "The index (axis labels) of the Series."},
 )
 Series._add_numeric_operations()
+# Series._add_series_only_operations()
 Series._add_series_or_dataframe_operations()
 
 # Add arithmetic!

pandas/tests/series/test_analytics.py

@@ -858,9 +858,41 @@ def test_ptp(self):
         arr = np.random.randn(N)
         ser = Series(arr)
         with tm.assert_produces_warning(FutureWarning, check_stacklevel=False):
-            print("hell")
             assert np.ptp(ser) == np.ptp(arr)
 
+        # GH11163
+        # s = Series([3, 5, np.nan, -3, 10])
+        # with tm.assert_produces_warning(FutureWarning, check_stacklevel=False):
+        #     assert s.ptp() == 13
+        #     assert pd.isna(s.ptp(skipna=False))
+
+        # mi = pd.MultiIndex.from_product([["a", "b"], [1, 2, 3]])
+        # s = pd.Series([1, np.nan, 7, 3, 5, np.nan], index=mi)
+
+        # expected = pd.Series([6, 2], index=["a", "b"], dtype=np.float64)
+        # with tm.assert_produces_warning(FutureWarning, check_stacklevel=False):
+        #     tm.assert_series_equal(s.ptp(level=0), expected)
+
+        # expected = pd.Series([np.nan, np.nan], index=["a", "b"])
+        # with tm.assert_produces_warning(FutureWarning, check_stacklevel=False):
+        #     tm.assert_series_equal(s.ptp(level=0, skipna=False), expected)
+
+        # msg = "No axis named 1 for object type <class 'pandas.core.series.Series'>"
+        # with pytest.raises(ValueError, match=msg):
+        #     with tm.assert_produces_warning(FutureWarning, check_stacklevel=False):
+        #         s.ptp(axis=1)
+
+        # s = pd.Series(["a", "b", "c", "d", "e"])
+        # msg = r"unsupported operand type\(s\) for -: 'str' and 'str'"
+        # with pytest.raises(TypeError, match=msg):
+        #     with tm.assert_produces_warning(FutureWarning, check_stacklevel=False):
+        #         s.ptp()
+
+        # msg = r"Series\.ptp does not implement numeric_only\."
+        # with pytest.raises(NotImplementedError, match=msg):
+        #     with tm.assert_produces_warning(FutureWarning, check_stacklevel=False):
+        #         s.ptp(numeric_only=True)
+
     def test_repeat(self):
         s = Series(np.random.randn(3), index=["a", "b", "c"])