使用python编写选择排序

# 需求，输入不少于0个学生，将分数从高到低排序出来


class Student:

    def __init__(self, student_name, student_score):
        self.student_name = student_name
        self.student_score = student_score


class StudentList:
    def __init__(self):
        self.student_list = list()
        self.set_students()
        self.get_students()
        self.desc_sort()
        self.get_students()

    def set_students(self):
        print('每行输入一个学生姓名和分数空,输入end结束....')
        while True:
            get_string = input('请输入姓名和分数之间空格隔开：')
            if get_string == 'end':
                break

            name, score = get_string.split()
            self.student_list.append(Student(name, float(score)))

    # 交换两个数值,声明为静态方法
    @staticmethod
    def swap_num(num1, num2):
        return num1 , num2

    # 倒叙排序方法  选择排序
    def desc_sort(self):
        if len(self.student_list) == 0:
            raise Exception('序列为空！')

        student_len = len(self.student_list)

        for i in range(student_len - 1):
            print('正在比较第{}个学生的分数'.format(i))
            max_index = i   # 假设最大的是当前这个

            j = i + 1
            while j < student_len:
                if self.student_list[j].student_score > self.student_list[max_index].student_score:
                    max_index = j
                j += 1

            if max_index != i:
                self.student_list[i], self.student_list[max_index] = \
                    self.swap_num(self.student_list[max_index], self.student_list[i])

    def get_students(self):
        for student in self.student_list:
            print(student.student_name, student.student_score)


if __name__ == '__main__':
    StudentList()