ENH: set/get value working for sparse classes too, close #437

pandas/core/sparse.py

@@ -940,6 +940,9 @@ def __getitem__(self, item):
             else: # pragma: no cover
                 raise
 
+    def _get_item_cache(self, key):
+        return self[key]
+
     def get_value(self, index, col):
         s = self._series[col]
         return s.get_value(index)
@@ -1506,9 +1509,7 @@ def _set_items(self, new_items):
     # DataFrame's columns / "items"
     minor_axis = SparsePanelAxis('_minor_axis', 'columns')
 
-    def __getitem__(self, key):
-        """
-        """
+    def _get_item_cache(self, key):
         return self._frames[key]
 
     def __setitem__(self, key, value):
@@ -1526,6 +1527,9 @@ def __setitem__(self, key, value):
         if key not in self.items:
             self._items = Index(list(self.items) + [key])
 
+    def set_value(self, item, row, column, value):
+        raise Exception('Sparse object scalar values are immutable')
+
     def __delitem__(self, key):
         loc = self.items.get_loc(key)
         indices = range(loc) + range(loc + 1, len(self.items))

pandas/tests/test_panel.py

@@ -305,6 +305,14 @@ def test_select(self):
         result = p.select(lambda x: x in ('foo',), axis='items')
         self.assert_panel_equal(result, p.reindex(items=[]))
 
+    def test_get_value(self):
+        for item in self.panel.items:
+            for mjr in self.panel.major_axis[::2]:
+                for mnr in self.panel.minor_axis:
+                    result = self.panel.get_value(item, mjr, mnr)
+                    expected = self.panel[item][mnr][mjr]
+                    assert_almost_equal(result, expected)
+
 class CheckIndexing(object):