python的学校问题

Question

输入多个学号和对应的成绩（001, 90, 003, 53, 002, 55）
输出不及格的同学的学号，按学号从小到大的顺序排序输出
如果没有不及格的，输出NONE

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Answer 1

grades = dict()
person = input("请输入人数：")
for i in range(int(person)):
    number = input("请输入学号：")
    if grades.__contains__(number):
        print("学号重复！")
    else:
        grade = input("请输入成绩：")
        grades[number] = int(grade)

flag = True
grades = dict(sorted(grades.items(), key=lambda e:e[0]))
print(grades)
for key, value in grades.items():
    if value < 60:
        print(key, value)
        flag = False
        
if flag:
    print("None")