GoF大话单例单例 静态方法+静态字段

# GoF设计模式
# 大话设计模式
# 当所有实例中封装的数据都相同时，单例
# 静态方法+静态字段
import pickle
class Teacher:
    def __init__(self,name,age):
        self.name = name
        self.age = age
        self.__asset = 0
class Course:
    def __init__(self,name,time,teacher):
        self.name = name
        self.time = time
        self.teacher = teacher
def main():
    t1 = Teacher("marry", 30)
    t2 = Teacher("may", 31)
    c1 = Course("语文", "8:00", t1)
    c2 = Course("数学", "9:00", t2)
    course_list = []
    course_list.append(c1)
    course_list.append(c2)
    pickle.dump(course_list, open("course_list", "wb"))
if __name__ == '__main__':
    main()

import pickle
from day.day1 import Course,Teacher
class Student:
    def __init__(self):
        pass

    def login(self):
        username = input("username:")
        password = input("password:")
        if username == "tom" and password == "123":
            print("登陆成功")
            return True
        return False

    def choice(self):
        ret = input("which course? :")
        return ret

if __name__ == '__main__':
    student = Student()
    if student.login():
        course_list = pickle.load(open("course_list","rb"))
        for i,item in enumerate(course_list,1):
            j = item.teacher
            print(i,item.name,item.time,j.name,j.age)

        ret = student.choice()
        i = course_list[int(ret)-1]
        print("选课成功")
        pickle.dump(i,open("tom_list","wb"))