有如下的代码：
class p1:
def __init__(self,a,b):
print("init in p1")
self.a1=a
self.b1=b
self.f1()
def f1(self):
print("f1 in p1")
class c1(p1):
def __init__(self,a,b,c=2):
print("init in c1")
p1.__init__(self,a,b)
self.c1=c
self.f1()
def f1(self):
print("f1 in p2")
class c2(c1):
pass
c=c2(11,22)
print(c.
