https://travis-ci.org/pandas-dev/pandas/jobs/256013691 this was working a few builds ago. I think maybe some random sorting details, IOW how exactly argsort works can make this fail with either '>' or '<'. so ok with changing test to accept either. ``` ________________________ TestMixedIntIndex.test_argsort ________________________ [gw1] linux -- Python 3.6.2 /home/travis/miniconda3/envs/pandas/bin/python self = <pandas.tests.indexes.test_base.TestMixedIntIndex object at 0x7fe54ca566a0> def test_argsort(self): idx = self.create_index() if PY36: with tm.assert_raises_regex(TypeError, "'>' not supported"): > result = idx.argsort() pandas/tests/indexes/test_base.py:1850: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ pandas/util/testing.py:2493: in __exit__ return self.exception_matches(exc_type, exc_value, trace_back) pandas/util/testing.py:2528: in exception_matches raise_with_traceback(e, trace_back) pandas/compat/__init__.py:343: in raise_with_traceback raise exc.with_traceback(traceback) pandas/tests/indexes/test_base.py:1850: in test_argsort result = idx.argsort() _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ self = Index([0, 'a', 1, 'b', 2, 'c'], dtype='object'), args = (), kwargs = {} result = array([0, 'a', 1, 'b', 2, 'c'], dtype=object) def argsort(self, *args, **kwargs): """ Returns the indices that would sort the index and its underlying data. Returns ------- argsorted : numpy array See also -------- numpy.ndarray.argsort """ result = self.asi8 if result is None: result = np.array(self) > return result.argsort(*args, **kwargs) E AssertionError: "'>' not supported" does not match "'<' not supported between instances of 'str' and 'int'" pandas/core/indexes/base.py:2102: AssertionError ```