通过__metaclass__为类动态增加方法实例

def ma(cls):
    print 'method a'

def mb(cls):
    print 'method b'

method_dict = {
    'ma':ma,
    'mb':mb
}


class DynamicMethod(type):
    def __new__(cls, name, bases, dct):
        if name[:3] == 'Abc':
            dct.update(method_dict)
        return type.__new__(cls, name, bases, dct)

    def __init__(cls, name, bases, dct):
        super(DynamicMethod, cls).__init__(name, bases, dct)


class AbcTest(object):
    __metaclass__ = DynamicMethod
    def mc(self, x):
        print x * 3

def main():
    a = AbcTest()
    a.mc(3)
    print dir(a)
    a.ma()

main()