class Student:
    count = 0  # 类属性
    def __init__(self, name):
        self.name = name  # 实例属性
        Student.count += 1

s1 = Student("张三")
s2 = Student("李四")
s1.count = 10
s3 = Student("王五")
print(Student.count, s1.count, s2.count)