1-Minute Metaclass
++++++++++++++++++

1-Minute Metaclass
==================

http://ianbicking.org/docs/pycon2005

::

    Ian Bicking
    Imaginary Landscape Web Development
    imagescape.com

It
==

::

    class OneMinuteMetaclass(type):
        def __new__(meta, class_name, bases, new_attrs):
            cls = type.__new__(
                meta, class_name, bases, new_attrs)
            if new_attrs.has_key('__classinit__'):
                cls.__classinit__ = staticmethod(
                    cls.__classinit__.im_func)
            cls.__classinit__(cls, new_attrs)
            return cls

Usage
=====

::

    class Form(object):
        __metaclass__ = OneMinuteMetaclass
        fields = []
        def __classinit__(cls, new_attrs):
            for name, value in new_attrs.values():
                if isinstance(value, Field):
                    value.name = name
                    self.fields.append(value)