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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
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