BUG: integer slices should never access label-indexing, GH #700

Author: wesm

pandas/core/series.py

@@ -309,7 +309,9 @@ def __getitem__(self, key):
     def _get_with(self, key):
         # other: fancy integer or otherwise
         if isinstance(key, slice):
-            if self.index.inferred_type == 'integer':
+            from pandas.core.indexing import _is_index_slice
+
+            if self.index.inferred_type == 'integer' or _is_index_slice(key):
                 indexer = key
             else:
                 indexer = self.ix._convert_to_indexer(key, axis=0)
@@ -390,7 +392,8 @@ def __setitem__(self, key, value):
     def _set_with(self, key, value):
         # other: fancy integer or otherwise
         if isinstance(key, slice):
-            if self.index.inferred_type == 'integer':
+            from pandas.core.indexing import _is_index_slice
+            if self.index.inferred_type == 'integer' or _is_index_slice(key):
                 indexer = key
             else:
                 indexer = self.ix._convert_to_indexer(key, axis=0)

pandas/tests/test_multilevel.py

@@ -1015,6 +1015,21 @@ def test_level_with_tuples(self):
         assert_frame_equal(result, expected)
         assert_frame_equal(result2, expected)
 
+    def test_int_series_slicing(self):
+        s = self.ymd['A']
+        result = s[5:]
+        expected = s.reindex(s.index[5:])
+        assert_series_equal(result, expected)
+
+        exp = self.ymd['A'].copy()
+        s[5:] = 0
+        exp.values[5:] = 0
+        self.assert_(np.array_equal(s.values, exp.values))
+
+        result = self.ymd[5:]
+        expected = self.ymd.reindex(s.index[5:])
+        assert_frame_equal(result, expected)
+
 if __name__ == '__main__':
 
     # unittest.main()