BUG: fix MultiIndex compatibility bugs described in #1534 post gutting internal array close #1534

Author: wesm

pandas/core/index.py

@@ -714,12 +714,12 @@ def get_indexer(self, target, method=None, limit=None):
 
         if method == 'pad':
             assert(self.is_monotonic)
-            indexer = self._engine.get_pad_indexer(target, limit)
+            indexer = self._engine.get_pad_indexer(target.values, limit)
         elif method == 'backfill':
             assert(self.is_monotonic)
-            indexer = self._engine.get_backfill_indexer(target, limit)
+            indexer = self._engine.get_backfill_indexer(target.values, limit)
         elif method is None:
-            indexer = self._engine.get_indexer(target)
+            indexer = self._engine.get_indexer(target.values)
         else:
             raise ValueError('unrecognized method: %s' % method)
 
@@ -1535,6 +1535,9 @@ def from_tuples(cls, tuples, sortorder=None, names=None):
             raise Exception('Cannot infer number of levels from empty list')
 
         if isinstance(tuples, np.ndarray):
+            if isinstance(tuples, Index):
+               tuples = tuples.values
+
             arrays = list(lib.tuples_to_object_array(tuples).T)
         elif isinstance(tuples, list):
             arrays = list(lib.to_object_array_tuples(tuples).T)

pandas/tests/test_index.py

@@ -939,6 +939,10 @@ def test_legacy_v2_unpickle(self):
         assert_almost_equal(res, exp)
         assert_almost_equal(exp, exp2)
 
+    def test_from_tuples_index_values(self):
+        result = MultiIndex.from_tuples(self.index)
+        self.assert_((result.values == self.index.values).all())
+
     def test_contains(self):
         self.assert_(('foo', 'two') in self.index)
         self.assert_(('bar', 'two') not in self.index)

pandas/tests/test_multilevel.py

@@ -1376,6 +1376,13 @@ def test_unicode_repr_issues(self):
         # NumPy bug
         # repr(index.get_level_values(1))
 
+    def test_dataframe_insert_column_all_na(self):
+        # GH #1534
+        mix = MultiIndex.from_tuples([('1a', '2a'), ('1a', '2b'), ('1a', '2c')])
+        df = DataFrame([[1,2],[3,4],[5,6]], index=mix)
+        s = Series({(1,1): 1, (1,2): 2})
+        df['new'] = s
+        self.assert_(df['new'].isnull().all())
 
 if __name__ == '__main__':