BUG: Bug in multi-index slicing with incomplete indexers (GH7399)

Author: jreback

doc/source/v0.14.1.txt

@@ -160,7 +160,7 @@ Bug Fixes
 
 
 
-
+- Bug in multi-index slicing with incomplete indexers (:issue:`7399`)
 
 
 

pandas/core/index.py

@@ -3526,8 +3526,8 @@ def _get_level_indexer(self, key, level=0):
             # handle a slice, returnig a slice if we can
             # otherwise a boolean indexer
 
-            start = level_index.get_loc(key.start)
-            stop  = level_index.get_loc(key.stop)
+            start = level_index.get_loc(key.start or  0)
+            stop  = level_index.get_loc(key.stop or len(level_index)-1)
             step = key.step
 
             if level > 0 or self.lexsort_depth == 0:

pandas/tests/test_indexing.py

@@ -1325,6 +1325,18 @@ def test_loc_multiindex(self):
         result = df.loc[[1,2]]
         assert_frame_equal(result, expected)
 
+        # GH 7399
+        # incomplete indexers
+        s = pd.Series(np.arange(15,dtype='int64'),MultiIndex.from_product([range(5), ['a', 'b', 'c']]))
+        expected = s.loc[:, 'a':'c']
+        result = s.loc[0:4, 'a':'c']
+        assert_series_equal(result, expected)
+
+        result = s.loc[:4, 'a':'c']
+        assert_series_equal(result, expected)
+
+        result = s.loc[0:, 'a':'c']
+        assert_series_equal(result, expected)
 
     def test_series_getitem_multiindex(self):