Commits

Wes McKinney authored a385e2b963c
ARROW-1739: [Python] Fix broken build due to using unittest.TestCase methods Author: Wes McKinney <wes.mckinney@twosigma.com> Closes #1255 from wesm/ARROW-1739 and squashes the following commits: f8d2457f [Wes McKinney] Fix flake 101f236c [Wes McKinney] Use pytest.raises instead of self.assertRaises