2.6 compatibility

Author: rekcahpassyla

pandas/core/generic.py

@@ -1282,22 +1282,21 @@ def _check_setitem_copy(self, stacklevel=4, t='setting', force=False):
             # a custom message
             if isinstance(self.is_copy, string_types):
                 t = self.is_copy
-
             elif t == 'referant':
                 t = ("\n"
                      "A value is trying to be set on a copy of a slice from a "
-                     "{}\n\n"
+                     "{name}\n\n"
                      "See the the caveats in the documentation: "
                      "http://pandas.pydata.org/pandas-docs/stable/indexing.html#indexing-view-versus-copy")
-
+                t = t.format(name=type(self).__name__)
             else:
                 t = ("\n"
                      "A value is trying to be set on a copy of a slice from a "
-                     "{}.\n"
+                     "{name}.\n"
                      "Try using .loc[row_indexer,col_indexer] = value instead\n\n"
                      "See the the caveats in the documentation: "
                      "http://pandas.pydata.org/pandas-docs/stable/indexing.html#indexing-view-versus-copy")
-            t = t.format(type(self).__name__)
+                t = t.format(name=type(self).__name__)
             if value == 'raise':
                 raise SettingWithCopyError(t)
             elif value == 'warn':