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+Metaclasses
+-----------
+
+Python 3 and Python 2 syntax for metaclasses are incompatible.
+``future`` provides a function (from ``jinja2/_compat.py``) called
+:func:`with_metaclass` that can assist with specifying metaclasses
+portably across Py3 and Py2. Use it like this::
+
+    from future.utils import with_metaclass
+
+    class BaseForm(object):
+        pass
+
+    class FormType(type):
+        pass
+
+    class Form(with_metaclass(FormType, BaseForm)):
+        pass