看这个代码，可以让你学得更多
class Person(object):
count = 0
def __init__(self,name):
self.name = name
Person.count +=1
p1 = Person('Bob')
p1.count = 100
print (p1.count)
p2 = Person('Alice')
print (Person.count)
p3 = Person('Tim')
print (Person.count)
