《Python程序设计与案例教程》例题源文件.rar

# 创建一个学校成员类 class SchoolMember: #总人数, 这个是类的变量 sum_member = 0 # __init__构造函数在类的对象被创建时执行 def __init__(self, name): self.name = name SchoolMember.sum_member += 1 print("学校新加入一个成员：%s" % self.name) print("学校共有%d人" % SchoolMember.sum_member) #自我介绍 def say_hello(self): print("大家好，我叫%s" % self.name) # __del__方法在对象不使用的时候运行 def __del__(self): SchoolMember.sum_member -= 1 print("%s离开了，学校还有%d人" % (self.name, SchoolMember.sum_ member)) #教师类继承学校成员类 class Teacher(SchoolMember): def __init__(self, name, grade): SchoolMember.__init__(self, name) self.grade = grade def say_hello(self): SchoolMember.say_hello(self) print("我是老师，我带的班级是%s班" % self.grade) def __del__(self): SchoolMember.__del__(self) #学生类 class Student(SchoolMember): def __init__(self, name, mark): SchoolMember.__init__(self, name) self.mark = mark def say_hello(self): SchoolMember.say_hello(self) print("我是学生，我的成绩是%d" % self.mark) def __del__(self): SchoolMember.__del__(self) t = Teacher("Andrea", "1502") t.say_hello() s = Student("Cindy", 77) s.say_hello()