added tests and fixed if statement

pandas/core/indexing.py

@@ -945,7 +945,10 @@ def _handle_lowerdim_multi_index_axis0(self, tup):
             # slices are unhashable
             pass
         except KeyError as ek:
-            if len(tup) > self.obj.ndim:
+            # raise KeyError if number of indexers match
+            # else IndexingError will be raised
+            if (len(tup) == len(self.obj.index._levels)
+                    and len(tup) > self.obj.ndim):
                 raise ek
         except Exception as e1:
             if isinstance(tup[0], (slice, Index)):

pandas/tests/indexing/multiindex/test_loc.py

@@ -7,6 +7,7 @@
 import pandas as pd
 from pandas import DataFrame, Index, MultiIndex, Series
 from pandas.util import testing as tm
+from pandas.core.indexing import IndexingError
 
 
 @pytest.fixture
@@ -130,6 +131,14 @@ def test_loc_multiindex(self):
             with pytest.raises(KeyError, match=r"^2L?$"):
                 mi_int.ix[2]
 
+        s = Series(range(8), index=MultiIndex.from_product(
+            [['a', 'b'], ['c', 'd'], ['e', 'f']]))
+
+        with pytest.raises(KeyError, match=r"^\('a', 'd', 'g'\)$"):
+            s.loc['a', 'd', 'g']
+        with pytest.raises(IndexingError, match='Too many indexers'):
+            s.loc['a', 'd', 'g', 'j']
+
     def test_loc_multiindex_indexer_none(self):
 
         # GH6788

pandas/tests/indexing/test_loc.py

@@ -122,7 +122,7 @@ def test_loc_getitem_label_out_of_range(self):
         self.check_result('label range', 'loc', 20, 'ix', 20,
                           typs=['ints', 'uints', 'mixed'], fails=KeyError)
         self.check_result('label range', 'loc', 20, 'ix', 20,
-                          typs=['labels'], fails=TypeError)
+                          typs=['labels'], fails=KeyError)
         self.check_result('label range', 'loc', 20, 'ix', 20, typs=['ts'],
                           axes=0, fails=TypeError)
         self.check_result('label range', 'loc', 20, 'ix', 20, typs=['floats'],