Python面向对象 组合（选课系统示例）

 # Author : Kelvin
 # Date : 2019/1/15 20:44

 """
 学校与老师关联
 课程与老师和学校关联
 """

 class School():
     def __init__(self, name, profession):
         self.name = name
         self.profession=profession

 class Teacher():
     def __init__(self, name, age, gender, school):
         self.name = name
         self.age = age
         self.gender = gender
         self.school=school

 class Course():
     def __init__(self, name, time, school, teacher):
         self.name = name
         self.time = time
         self.school = school
         self.teacher = teacher

 s1 = School("大庆师范学院", "计算机专业")
 s2 = School("大庆师范学院", "生物工程专业")
 s3 = School("大庆师范学院", "外国语专业")

 t1 = Teacher("kelvin", 22, "male", s1)
 t2 = Teacher("alex", 23, "male", s3)
 t3 = Teacher("jam", 25, "female", s2)

 msg1="""
 学校选项：
 1:"大庆师范学院", "计算机专业"
 2:"大庆师范学院", "生物工程专业"
 3:"大庆师范学院", "外国语专业"
 """
 msg2="""
 教师选项：
 1:"kelvin", 22, "male", "大庆师范学院", "计算机专业"
 2:"alex", 23, "male", "大庆师范学院", "外国语专业"
 3:"jam", 25, "female","大庆师范学院", "生物工程专业"
 """
 while True:
     print(msg1)
     choice1 = input("请选择学校专业：")
     s = {
         "": s1,
         "": s2,
         "": s3
     }
     if choice1 in s:
         sx = s[choice1]
     else:
         print("专业选择异常，请重试！")
         break

     print(msg2)
     choice2 = input("请选择老师：")
     t = {
         "": t1,
         "": t2,
         "": t3
     }
     if choice2 in t:
         tx = t[choice2]
     else:
         print("教师选择异常，请重试！")
         break
     course_name = input("请输入课程名：")
     course_time = input("请输入课程时长：")
     new_course = Course(course_name, course_time, sx, tx)
     print("选课成功！  [%s]课程所属的学校是[%s]专业是[%s]   老师名字[%s]年龄[%s]性别[%s]所属学校[%s]专业[%s]  课程时长：[%s]" % (
         new_course.name, new_course.school.name, new_course.school.profession, new_course.teacher.name,
         new_course.teacher.age, new_course.teacher.gender, new_course.teacher.school.name,new_course.teacher.school.profession,new_course.time))
     break