NH: gb.is_monotonic_increasing pandas-dev#17015 alternate version to remove function defs

Author: No-Stream

pandas/core/groupby.py

@@ -281,7 +281,9 @@
 ]) | _plotting_methods
 
 _series_apply_whitelist = ((_common_apply_whitelist |
-                            {'nlargest', 'nsmallest'}) -
+                            {'nlargest', 'nsmallest',
+                             'is_monotonic_increasing',
+                             'is_monotonic_decreasing'}) -
                            {'boxplot'}) | frozenset(['dtype', 'unique'])
 
 _dataframe_apply_whitelist = ((_common_apply_whitelist |
@@ -1826,63 +1828,6 @@ def pipe(self, func, *args, **kwargs):
         """
         return _pipe(self, func, *args, **kwargs)
 
-    @Substitution(name='groupby')
-    @Appender(_doc_template)
-    def is_monotonic_increasing(self):
-        """
-        Returns whether each group is monotonically increasing.
-
-        Equivalent to ``.apply(lambda x: x.is_monotonic_increasing)``.
-
-        .. versionadded:: 0.22.0
-
-        Examples
-        --------
-        >>> source_dict = {
-        ...    'A': ['this', 'col', 'is', 'entirely', 'irrelevant', '.'],
-        ...    'B': ['cat_a', 'cat_a', 'cat_a', 'cat_b', 'cat_b', 'cat_b'],
-        ...    'C': [1, 2, 3, 2, 2, 0]}
-
-        >>> df = pd.DataFrame(source_dict)
-        ...    df.groupby(['B']).C.is_monotonic_increasing()
-        B
-        cat_a    True
-        cat_b    False
-        Name: C, dtype: bool
-
-        See Also
-        --------
-        pandas.Series.is_monotonic_increasing
-        pandas.Index.is_monotonic_increasing
-        """
-        return self.apply(lambda x: x.is_monotonic_increasing)
-
-    @Substitution(name='groupby')
-    @Appender(_doc_template)
-    def is_monotonic_decreasing(self):
-        """
-        Returns whether each group is monotonically decreasing.
-
-        Equivalent to ``.apply(lambda x: x.is_monotonic_decreasing)``.
-
-        .. versionadded:: 0.22.0
-
-        Examples
-        --------
-        >>> source_dict = {
-        ...    'A': ['this', 'col', 'is', 'entirely', 'irrelevant', '.'],
-        ...    'B': ['cat_a', 'cat_a', 'cat_a', 'cat_b', 'cat_b', 'cat_b'],
-        ...    'C': [1, 2, 3, 2, 2, 0]}
-
-        >>> df = pd.DataFrame(source_dict)
-        ...    df.groupby(['B']).C.is_monotonic_decreasing()
-        B
-        cat_a    False
-        cat_b    True
-        Name: C, dtype: bool
-        """
-        return self.apply(lambda x: x.is_monotonic_decreasing)
-
 
 GroupBy._add_numeric_operations()
 

pandas/tests/groupby/test_groupby.py

@@ -2622,13 +2622,13 @@ def test_is_monotonic_increasing(self, in_vals, out_vals):
             'B': ['a', 'a', 'a', 'b', 'b', 'b', 'c', 'c', 'c', 'd', 'd'],
             'C': in_vals}
         df = pd.DataFrame(source_dict)
-        result = df.groupby('B').C.is_monotonic_increasing()
+        result = df.groupby('B').C.is_monotonic_increasing
         index = Index(list('abcd'), name='B')
         expected = pd.Series(index=index, data=out_vals, name='C')
         tm.assert_series_equal(result, expected)
 
         # Also check result equal to manually taking x.is_monotonic_increasing.
-        expected = (
+        expecteAd = (
             df.groupby(['B']).C.apply(lambda x: x.is_monotonic_increasing))
         tm.assert_series_equal(result, expected)
 
@@ -2654,7 +2654,7 @@ def test_is_monotonic_decreasing(self, in_vals, out_vals):
             'C': in_vals}
 
         df = pd.DataFrame(source_dict)
-        result = df.groupby('B').C.is_monotonic_decreasing()
+        result = df.groupby('B').C.is_monotonic_decreasing
         index = Index(list('abcd'), name='B')
         expected = pd.Series(index=index, data=out_vals, name='C')
         tm.assert_series_equal(result, expected)

pandas/tests/groupby/test_whitelist.py

@@ -88,6 +88,8 @@
     'unique',
     'nlargest',
     'nsmallest',
+    'is_monotonic_increasing',
+    'is_monotonic_decreasing',
 ])
 
 
@@ -250,7 +252,6 @@ def test_tab_completion(mframe):
         'take', 'tshift', 'pct_change', 'any', 'mad', 'corr', 'corrwith',
         'cov', 'dtypes', 'ndim', 'diff', 'idxmax', 'idxmin',
         'ffill', 'bfill', 'pad', 'backfill', 'rolling', 'expanding', 'pipe',
-        'is_monotonic_increasing', 'is_monotonic_decreasing'
     }
     assert results == expected