Override SparseArray.tolist() to return *dense* list

Author: kernc

pandas/core/sparse/array.py

@@ -592,6 +592,10 @@ def astype(self, dtype=None, copy=True):
         return self._simple_new(sp_values, self.sp_index,
                                 fill_value=fill_value)
 
+    def tolist(self):
+        """Return *dense* self as list"""
+        return self.values.tolist()
+
     def copy(self, deep=True):
         """
         Make a copy of the SparseArray. Only the actual sparse values need to