gist for https://www.v2ex.com/t/157851 , a small sample for class

gistfile1.py

class Foo(object):
    def talk(self, name):
        raise NotImplementedError
    def fly(self, ID):
        raise NotImplementedError

class AAA(Foo):
    def talk(self, name):
        print "AAA: talking to %s now" % name
    def fly(self, ID):
        print "AAA: I think %s can fly" % ID

class BBB(Foo):
    def talk(self, name):
        print "BBB: talking to %s now" % name
    def fly(self, ID):
        print "BBB: I think %s can fly" % ID

def handle_check(CheckingClass):
    ins = CheckingClass()
    return ins

# test
h = handle_check(AAA)
h.talk("recall704")
# AAA: talking to recall704 now
h.fly(74234)
# AAA: I think 74234 can fly