Changed to tm.assertRaisesRegexp for Python 2 compat.

Author: Joshua Bradt

pandas/tests/test_reshape.py

@@ -92,7 +92,7 @@ def test_tuple_vars_fail_with_multiindex(self):
 
         for id_vars, value_vars in ((tuple_a, list_b), (list_a, tuple_b),
                                     (tuple_a, tuple_b)):
-            with self.assertRaisesRegex(ValueError, r'MultiIndex'):
+            with tm.assertRaisesRegexp(ValueError, r'MultiIndex'):
                 melt(self.df1, id_vars=id_vars, value_vars=value_vars)
 
     def test_custom_var_name(self):