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()