fi

Author: jreback

doc/source/whatsnew/v0.23.0.txt

@@ -502,7 +502,7 @@ Reshaping
 - Bug in :func:`Dataframe.pivot_table` which fails when the ``aggfunc`` arg is of type string.  The behavior is now consistent with other methods like ``agg`` and ``apply`` (:issue:`18713`)
 - Bug in :func:`DataFrame.merge` in which merging using ``Index`` objects as vectors raised an Exception (:issue:`19038`)
 - Bug in :func:`DataFrame.stack`, :func:`DataFrame.unstack`, :func:`Series.unstack` which were not returning subclasses (:issue:`15563`)
-- Bug in timezone comparisons, manifesting as a conversion of the index to UTC when ``.reset_index()`` (:issue:`18523`)
+- Bug in timezone comparisons, manifesting as a conversion of the index to UTC in ``.concat()`` (:issue:`18523`)
 -
 
 Numeric

pandas/tests/indexes/datetimes/test_construction.py

@@ -443,26 +443,6 @@ def test_000constructor_resolution(self):
 
         assert idx.nanosecond[0] == t1.nanosecond
 
-    def test_concat(self):
-        idx1 = pd.date_range('2011-01-01', periods=3, freq='H',
-                             tz='Europe/Paris')
-        idx2 = pd.date_range(start=idx1[0], end=idx1[-1], freq='H')
-        df1 = pd.DataFrame({'a': [1, 2, 3]}, index=idx1)
-        df2 = pd.DataFrame({'b': [1, 2, 3]}, index=idx2)
-        res = pd.concat([df1, df2], axis=1)
-
-        assert str(res.index.tzinfo) == str(df1.index.tzinfo)
-        assert str(res.index.tzinfo) == str(df2.index.tzinfo)
-
-        idx3 = pd.date_range('2011-01-01', periods=3,
-                             freq='H', tz='Asia/Tokyo')
-        df3 = pd.DataFrame({'b': [1, 2, 3]}, index=idx3)
-        res = pd.concat([df1, df3], axis=1)
-
-        assert str(res.index.tzinfo) == 'UTC'
-        assert str(res.index.tzinfo) != str(df1.index.tzinfo)
-        assert str(res.index.tzinfo) != str(df3.index.tzinfo)
-
 
 class TestTimeSeries(object):