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Changes between Version 2 and Version 3 of Ticket #22678, comment 2

-              v2
+              v3
 concatenation (e.g. 'id_'+key) in all cases, so it blows up nice and fast with any form of key that
 does not actually fully work.
+This kind of does it, subject to a future optimizer dropping the empty string:
+{{{
+# django/forms/forms.py
+class BaseForm(object):
+ for name, field in self.fields.items():
+     html_class_attr = ''
+     bf = self[name+'']
+}}}