class Turtle:
def init(self,x):
self.num=x
class Fish:
def init(self,x):
self.num=x
class Pool:
def init(self,x,y):
self.turtle=Turtle(x)
self.fish=Fish(y)
def print_num(self):
print(“水池里总共有乌龟%d只，小鱼%d条！”%(self.turtle.num,self.fish.num))
pool=Pool(1,10)
