bug in py2.7 duplicate indexing

Author: jreback

pandas/index.pyx

@@ -182,7 +182,7 @@ cdef class IndexEngine:
             Py_ssize_t i, n
             int last_true
 
-        values = self._get_index_values()
+        values = np.array(self._get_index_values(), copy=False)
         n = len(values)
 
         result = np.empty(n, dtype=bool)

pandas/tests/indexes/test_multi.py

@@ -1117,6 +1117,17 @@ def test_get_loc_duplicates(self):
         xp = 0
         assert (rs == xp)
 
+    def test_get_value_duplicates(self):
+        index = MultiIndex(levels=[['D', 'B', 'C'],
+                                   [0, 26, 27, 37, 57, 67, 75, 82]],
+                           labels=[[0, 0, 0, 1, 2, 2, 2, 2, 2, 2],
+                                   [1, 3, 4, 6, 0, 2, 2, 3, 5, 7]],
+                           names=['tag', 'day'])
+
+        assert index.get_loc('D') == slice(0, 3)
+        with pytest.raises(KeyError):
+            index._engine.get_value(np.array([]), 'D')
+
     def test_get_loc_level(self):
         index = MultiIndex(levels=[Index(lrange(4)), Index(lrange(4)), Index(
             lrange(4))], labels=[np.array([0, 0, 1, 2, 2, 2, 3, 3]), np.array(

pandas/tests/indexing/test_multiindex.py

@@ -413,9 +413,10 @@ def f():
         df.loc[idx[:, :, 'Stock'], 'price'] *= 2
         tm.assert_frame_equal(df, expected)
 
-    def test_getitem_multiindex(self):
+    def test_getitem_duplicates_multiindex(self):
         # GH 5725 the 'A' happens to be a valid Timestamp so the doesn't raise
         # the appropriate error, only in PY3 of course!
+
         index = MultiIndex(levels=[['D', 'B', 'C'],
                                    [0, 26, 27, 37, 57, 67, 75, 82]],
                            labels=[[0, 0, 0, 1, 2, 2, 2, 2, 2, 2],