--学生クラスの設計-属性:名前、学生番号、年齢、成績-クラスクラスの設計-属性:クラス番号、すべての学生-要件:クラスへの学生の追加、学生の削除、学生の表示、指定した条件によるソートの実装

python
#    
class Student:
    def __init__(self, name, num, age, score):
        self.name = name
        self.num = num
        self.age = age
        self.score = score

    def __str__(self):
        return '  :{}   :{}   :{}   :{}'.format(self.name, self.num, self.age, self.score)


#    
class Class:
    def __init__(self, name):
        self.name = name
        self.stu_list = []
        self.stu_dict = {}

    #     
    def add_stu(self, stu):
        self.stu_list.append(stu)
        self.stu_dict[stu.num] = stu

    #     
    def del_stu(self, num):
        #          
        s = self.stu_dict.pop(num)
        #       
        self.stu_list.remove(s)

    #     
    def sort_stu(self, key=None, reverse=False):
        self.stu_list.sort(key=key, reverse=reverse)

    #     
    def get_stu(self, num):
        return self.stu_dict.get(num)

    #       
    def show_stu(self):
        for s in self.stu_list:
            print(s)


from random import randint

#       
c = Class('ZZ-JY-PY1805')

#     
for i in range(10):
    name = 'stu' + str(i+1)
    num = 100 + i
    age = randint(20, 30)
    score = randint(0, 100)
    #       
    stu = Student(name, num, age, score)
    #         
    c.add_stu(stu)

#     
c.sort_stu(key=lambda s: s.score, reverse=True)

#       
c.show_stu()

s = c.get_stu(104)
print(s)