Fix fixture

Author: mroeschke

pandas/conftest.py

@@ -96,7 +96,6 @@ def compression_no_zip(request):
 
 
 @pytest.fixture(scope='module')
-@pytest.mark.skipif(not pandas.compat.PY3)
 def datetime_tz_utc():
     from datetime import timezone
     return timezone.utc

pandas/tests/indexes/datetimes/test_timezones.py

@@ -17,7 +17,7 @@
 import pandas as pd
 from pandas._libs import tslib
 from pandas._libs.tslibs import timezones
-from pandas.compat import lrange, zip
+from pandas.compat import lrange, zip, PY3
 from pandas import (DatetimeIndex, date_range, bdate_range,
                     Timestamp, isna, to_datetime, Index)
 
@@ -952,6 +952,7 @@ def test_dti_union_aware(self):
     @pytest.mark.parametrize('tz', [None, 'UTC', "US/Central",
                                     dateutil.tz.tzoffset(None, -28800)])
     @pytest.mark.usefixtures("datetime_tz_utc")
+    @pytest.mark.skipif(not PY3, reason="datetime.timezone not in PY2")
     def test_iteration_preserves_nanoseconds(self, tz):
         # GH 19603
         index = DatetimeIndex(["2018-02-08 15:00:00.168456358",