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woocode / py / object / metaclass-1.py

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#!/usr/bin/env python
# -*- encoding:utf-8 -*-

class UpperAttrMetaclass(type):
    def __new__(upperattr_metaclass, future_class_name,
                future_class_parents, future_class_attr):
        attrs = ((name, value) for name, value in future_class_attr.items()
                if not name.startswith('__'))
        uppercase_attr = dict((name.upper(), value) for name, value in attrs)
        return type(future_class_name, future_class_parents, uppercase_attr)


class Foo:
    __metaclass__ = UpperAttrMetaclass
    def foo(self):
        print 'Upper'

f = Foo()
f.FOO()