【算法代码】
class Cat:
count=0 #类变量。其值将在类的所有实例之间共享
def __init__(self, name, age):
self.name=name
self.age=age
Cat.count+=1
cat1=Cat("C1", 1)
cat2=Cat("C2", 2)
cat3=Cat("C3", 3)
cat4=Cat("C4", 4)
cat5=Cat("C5", 5)
print("Having %s cats were instantiated." %Cat.count)
【参考文献】
http://c.biancheng.net/view/2283.html