Actually (hopefully) fix test failure on 2.7

Author: pitrou

pandas/core/indexing.py

@@ -1328,7 +1328,7 @@ def __init__(self, name, obj):
             http://pandas.pydata.org/pandas-docs/stable/indexing.html#ix-indexer-is-deprecated""")  # noqa
 
         warnings.warn(_ix_deprecation_warning,
-                      DeprecationWarning, stacklevel=3)
+                      DeprecationWarning, stacklevel=2)
         super(_IXIndexer, self).__init__(name, obj)
 
     def _has_valid_type(self, key, axis):

pandas/tests/indexing/test_ix.py

@@ -21,8 +21,7 @@ def test_ix_deprecation(self):
 
         df = DataFrame({'A': [1, 2, 3]})
         with tm.assert_produces_warning(DeprecationWarning,
-                                        check_stacklevel=False,
-                                        clear=[pd.core.indexing]):
+                                        check_stacklevel=False):
             df.ix[1, 'A']
 
     def test_ix_loc_setitem_consistency(self):