ENH: gb.is_monotonic_increasing pandas-dev#17015 rebase to upstream/master

Author: No-Stream

doc/source/whatsnew/v0.21.1.txt

@@ -22,8 +22,8 @@ Other Enhancements
 ^^^^^^^^^^^^^^^^^^
 
 - :meth:`Timestamp.timestamp` is now available in Python 2.7. (:issue:`17329`)
+- :class:`Grouper` and :class:`TimeGrouper` now have a friendly repr output (:issue:`18203`).
 - :meth:`groupby.is_monotonic_increasing()` and :meth:`.is_monotonic_decreasing()` extend :meth:`Series.is_monotonic_increasing()` to groups. (:issue:`17015`)
--
 
 .. _whatsnew_0211.deprecations:
 

pandas/tests/groupby/test_whitelist.py

@@ -239,18 +239,18 @@ def test_groupby_blacklist(df_letters):
 def test_tab_completion(mframe):
     grp = mframe.groupby(level='second')
     results = set([v for v in dir(grp) if not v.startswith('_')])
-    expected = set(
-        ['A', 'B', 'C', 'agg', 'aggregate', 'apply', 'boxplot', 'filter',
-         'first', 'get_group', 'groups', 'hist', 'indices', 'last', 'max',
-         'mean', 'median', 'min', 'ngroups', 'nth', 'ohlc', 'plot',
-         'prod', 'size', 'std', 'sum', 'transform', 'var', 'sem', 'count',
-         'nunique', 'head', 'describe', 'cummax', 'quantile',
-         'rank', 'cumprod', 'tail', 'resample', 'cummin', 'fillna',
-         'cumsum', 'cumcount', 'ngroup', 'all', 'shift', 'skew',
-         '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'])
+    expected = {
+        'A', 'B', 'C', 'agg', 'aggregate', 'apply', 'boxplot', 'filter',
+        'first', 'get_group', 'groups', 'hist', 'indices', 'last', 'max',
+        'mean', 'median', 'min', 'ngroups', 'nth', 'ohlc', 'plot',
+        'prod', 'size', 'std', 'sum', 'transform', 'var', 'sem', 'count',
+        'nunique', 'head', 'describe', 'cummax', 'quantile',
+        'rank', 'cumprod', 'tail', 'resample', 'cummin', 'fillna',
+        'cumsum', 'cumcount', 'ngroup', 'all', 'shift', 'skew',
+        '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