TST: dateutil fixes (GH8639)

doc/source/whatsnew/v0.15.2.txt

@@ -163,6 +163,7 @@ Bug Fixes
 - Bug in ``DatetimeIndex`` when using ``time`` object as key (:issue:`8667`)
 - Bug in ``merge`` where ``how='left'`` and ``sort=False`` would not preserve left frame order (:issue:`7331`)
 - Bug in ``MultiIndex.reindex`` where reindexing at level would not reorder labels (:issue:`4088`)
+- Bug in certain operations with dateutil timezones, manifesting with dateutil 2.3 (:issue:`8639`)
 
 - Fix negative step support for label-based slices (:issue:`8753`)
 

pandas/tseries/tests/test_daterange.py

@@ -371,31 +371,31 @@ def test_range_tz_pytz(self):
         self.assertEqual(dr.tz.zone, tz.zone)
         self.assertEqual(dr[0], start)
         self.assertEqual(dr[2], end)
-    
+
     def test_range_tz_dst_straddle_pytz(self):
-        
+
         tm._skip_if_no_pytz()
         from pytz import timezone
         tz = timezone('US/Eastern')
-        dates = [(tz.localize(datetime(2014, 3, 6)), 
+        dates = [(tz.localize(datetime(2014, 3, 6)),
                   tz.localize(datetime(2014, 3, 12))),
-                 (tz.localize(datetime(2013, 11, 1)), 
+                 (tz.localize(datetime(2013, 11, 1)),
                   tz.localize(datetime(2013, 11, 6)))]
         for (start, end) in dates:
             dr = date_range(start, end, freq='D')
             self.assertEqual(dr[0], start)
             self.assertEqual(dr[-1], end)
             self.assertEqual(np.all(dr.hour==0), True)
-            
+
             dr = date_range(start, end, freq='D', tz='US/Eastern')
             self.assertEqual(dr[0], start)
             self.assertEqual(dr[-1], end)
-            self.assertEqual(np.all(dr.hour==0), True)        
-            
+            self.assertEqual(np.all(dr.hour==0), True)
+
             dr = date_range(start.replace(tzinfo=None), end.replace(tzinfo=None), freq='D', tz='US/Eastern')
             self.assertEqual(dr[0], start)
             self.assertEqual(dr[-1], end)
-            self.assertEqual(np.all(dr.hour==0), True)        
+            self.assertEqual(np.all(dr.hour==0), True)
 
     def test_range_tz_dateutil(self):
         # GH 2906
@@ -441,7 +441,7 @@ def test_month_range_union_tz_pytz(self):
     def test_month_range_union_tz_dateutil(self):
         _skip_if_windows_python_3()
         tm._skip_if_no_dateutil()
-        from dateutil.tz import gettz as timezone
+        from dateutil.zoneinfo import gettz as timezone
         tz = timezone('US/Eastern')
 
         early_start = datetime(2011, 1, 1)

pandas/tseries/tests/test_timeseries.py

@@ -419,7 +419,7 @@ def test_timestamp_to_datetime_explicit_dateutil(self):
         tm._skip_if_no_dateutil()
         import dateutil
         rng = date_range('20090415', '20090519',
-                         tz=dateutil.tz.gettz('US/Eastern'))
+                         tz=dateutil.zoneinfo.gettz('US/Eastern'))
 
         stamp = rng[0]
         dtval = stamp.to_pydatetime()
@@ -1797,7 +1797,7 @@ def test_append_concat_tz_explicit_pytz(self):
     def test_append_concat_tz_dateutil(self):
         # GH 2938
         tm._skip_if_no_dateutil()
-        from dateutil.tz import gettz as timezone
+        from dateutil.zoneinfo import gettz as timezone
 
         rng = date_range('5/8/2012 1:45', periods=10, freq='5T',
                          tz='dateutil/US/Eastern')

pandas/tseries/tests/test_timezones.py

@@ -443,7 +443,7 @@ def test_ambiguous_infer(self):
         localized_old = di.tz_localize(tz, infer_dst=True)
         self.assert_numpy_array_equal(dr, localized_old)
         self.assert_numpy_array_equal(dr, DatetimeIndex(times, tz=tz, ambiguous='infer'))
-        
+
         # When there is no dst transition, nothing special happens
         dr = date_range(datetime(2011, 6, 1, 0), periods=10,
                         freq=datetools.Hour())
@@ -463,31 +463,31 @@ def test_ambiguous_flags(self):
         times = ['11/06/2011 00:00', '11/06/2011 01:00',
                  '11/06/2011 01:00', '11/06/2011 02:00',
                  '11/06/2011 03:00']
-        
+
         # Test tz_localize
         di = DatetimeIndex(times)
         is_dst = [1, 1, 0, 0, 0]
         localized = di.tz_localize(tz, ambiguous=is_dst)
         self.assert_numpy_array_equal(dr, localized)
         self.assert_numpy_array_equal(dr, DatetimeIndex(times, tz=tz, ambiguous=is_dst))
-        
+
         localized = di.tz_localize(tz, ambiguous=np.array(is_dst))
         self.assert_numpy_array_equal(dr, localized)
-        
+
         localized = di.tz_localize(tz, ambiguous=np.array(is_dst).astype('bool'))
         self.assert_numpy_array_equal(dr, localized)
-        
+
         # Test constructor
         localized = DatetimeIndex(times, tz=tz, ambiguous=is_dst)
         self.assert_numpy_array_equal(dr, localized)
-             
+
         # Test duplicate times where infer_dst fails
         times += times
         di = DatetimeIndex(times)
-        
+
         # When the sizes are incompatible, make sure error is raised
         self.assertRaises(Exception, di.tz_localize, tz, ambiguous=is_dst)
-        
+
         # When sizes are compatible and there are repeats ('infer' won't work)
         is_dst = np.hstack((is_dst, is_dst))
         localized = di.tz_localize(tz, ambiguous=is_dst)
@@ -501,15 +501,15 @@ def test_ambiguous_flags(self):
         localized = dr.tz_localize(tz)
         localized_is_dst = dr.tz_localize(tz, ambiguous=is_dst)
         self.assert_numpy_array_equal(localized, localized_is_dst)
-        
+
     def test_ambiguous_nat(self):
         tz = self.tz('US/Eastern')
         times = ['11/06/2011 00:00', '11/06/2011 01:00',
                  '11/06/2011 01:00', '11/06/2011 02:00',
                  '11/06/2011 03:00']
         di = DatetimeIndex(times)
         localized = di.tz_localize(tz, ambiguous='NaT')
-        
+
         times = ['11/06/2011 00:00', np.NaN,
                  np.NaN, '11/06/2011 02:00',
                  '11/06/2011 03:00']

pandas/tseries/tests/test_tslib.py

@@ -1,5 +1,5 @@
 import nose
-
+from distutils.version import LooseVersion
 import numpy as np
 
 from pandas import tslib
@@ -137,13 +137,24 @@ def test_constructor_with_stringoffset(self):
         self.assertEqual(result, eval(repr(result)))
 
     def test_repr(self):
+        tm._skip_if_no_pytz()
+        tm._skip_if_no_dateutil()
+
         dates = ['2014-03-07', '2014-01-01 09:00', '2014-01-01 00:00:00.000000001']
-        timezones = ['UTC', 'Asia/Tokyo', 'US/Eastern', 'dateutil/America/Los_Angeles']
+
+        # dateutil zone change (only matters for repr)
+        import dateutil
+        if dateutil.__version__ >= LooseVersion('2.3'):
+            timezones = ['UTC', 'Asia/Tokyo', 'US/Eastern', 'dateutil/US/Pacific']
+        else:
+            timezones = ['UTC', 'Asia/Tokyo', 'US/Eastern', 'dateutil/America/Los_Angeles']
+
         freqs = ['D', 'M', 'S', 'N']
 
         for date in dates:
             for tz in timezones:
                 for freq in freqs:
+
                     # avoid to match with timezone name
                     freq_repr = "'{0}'".format(freq)
                     if tz.startswith('dateutil'):
@@ -306,10 +317,10 @@ def test_now(self):
         ts_from_string = Timestamp('now')
         ts_from_method = Timestamp.now()
         ts_datetime = datetime.datetime.now()
-        
+
         ts_from_string_tz = Timestamp('now', tz='US/Eastern')
         ts_from_method_tz = Timestamp.now(tz='US/Eastern')
-        
+
         # Check that the delta between the times is less than 1s (arbitrarily small)
         delta = Timedelta(seconds=1)
         self.assertTrue((ts_from_method - ts_from_string) < delta)
@@ -321,10 +332,10 @@ def test_today(self):
         ts_from_string = Timestamp('today')
         ts_from_method = Timestamp.today()
         ts_datetime = datetime.datetime.today()
-        
+
         ts_from_string_tz = Timestamp('today', tz='US/Eastern')
         ts_from_method_tz = Timestamp.today(tz='US/Eastern')
-        
+
         # Check that the delta between the times is less than 1s (arbitrarily small)
         delta = Timedelta(seconds=1)
         self.assertTrue((ts_from_method - ts_from_string) < delta)
@@ -737,7 +748,7 @@ def test_resolution(self):
         for freq, expected in zip(['A', 'Q', 'M', 'D', 'H', 'T', 'S', 'L', 'U'],
                                   [tslib.D_RESO, tslib.D_RESO, tslib.D_RESO, tslib.D_RESO,
                                    tslib.H_RESO, tslib.T_RESO,tslib.S_RESO, tslib.MS_RESO, tslib.US_RESO]):
-            for tz in [None, 'Asia/Tokyo', 'US/Eastern']:
+            for tz in [None, 'Asia/Tokyo', 'US/Eastern', 'dateutil/US/Eastern']:
                 idx = date_range(start='2013-04-01', periods=30, freq=freq, tz=tz)
                 result = tslib.resolution(idx.asi8, idx.tz)
                 self.assertEqual(result, expected)