python实现AO对象

class A(object):
    def __init__(self,a,b):
        self.a=a
        self.b=b
class B(object):
    def __init__(self,a,c):
        self.a = None
        self.c = ''

    def f_a(self):
        self.a = A("a","b")
        self.c = "c"
    def f_b(self):
        print self.c
        print self.a.a

    def f_run(self):
        self.f_a()
        self.f_b()

if __name__ == '__main__':
    b=B('','')
    b.f_run()
"""
console : c  a
"""