Python 利用字典设计学生成绩信息系统 能帮忙看一下是哪出问题了吗

Question

Python 利用字典设计学生成绩信息系统
结果操作的时候出现问题
说有关遍历的操作的循环有问题，请问是哪出问题了吗》如何解决呢？

while True:
students = {'1001': {'name': "Janis Joplin", 'gender': 'male', 'age': 19, 'score': 598, 'subject1': '高等数学',
'subject2': "珠宝设计", 'score1': "高等数学78", 'score2': "珠宝设计99"},
'1002': {'name': "Kurt Cobain", 'gender': 'female', 'age': 18, 'score': 556, 'subject1': 'C语言程序设计',
'subject2': "艺术鉴赏", 'score1': "C语言程序设计82", 'score2': "艺术鉴赏67"},
'1003': {'name': "Gogo", 'gender': 'female', 'age': 20, 'score': 588, 'subject1': "离散数学",
'subject2': " 数据结构", 'score1': "离散数学78", 'score2': "数据结构99", },
'1004': {'name': "Jimi", 'gender': 'male', 'age': 18, 'score': 568, 'subject1': "Python程序设计",
'subject2': "html基础", 'score1': "Python程序设计89", 'score2': "html基础77"},
"1001 高等数学": {"score": 78},
"1001 珠宝设计": {"score": 99},
"1002 C语言成句设计": {"score": 82},
"1002 艺术鉴赏": {"score": 67},
"1003 离散数学": {"score": 78},
"1003 数据结构": {"score": 99},
"1004 Python程序设计": {"score": 89},
"1004 html基础": {"score": 77},
}

print("1.字典中存储字典")
print("2.输入ID是1001的信息")
print("3.按照输入的ID进行查询")
print("4.字典嵌套的遍历")
print("5.统计男女各有多少人，输入年龄大于18岁的学生的姓名")
print("6.输出成绩最高的学生信息")
print("7.遍历学生所选课程")
print("8.遍历学生各科成绩")
print("9.查找学生指定学科成绩")
print("10.退出系统")
n = int(input("请输入你的操作选项："))
if n == 1:
    students = {'1001': {'name': "Janis Joplin", 'gender': 'male', 'age': 19, 'score': 598, 'subject1': '高等数学',
                         'subject2': "珠宝设计", 'score1': "高等数学78", 'score2': "珠宝设计99"},
                '1002': {'name': "Kurt Cobain", 'gender': 'female', 'age': 18, 'score': 556, 'subject1': 'C语言程序设计',
                         'subject2': "艺术鉴赏", 'score1': "C语言程序设计82", 'score2': "艺术鉴赏67"},
                '1003': {'name': "Gogo", 'gender': 'female', 'age': 20, 'score': 588, 'subject1': "离散数学",
                         'subject2': " 数据结构", 'score1': "离散数学78", 'score2': "数据结构99",},
                '1004': {'name': "Jimi", 'gender': 'male', 'age': 18, 'score': 568, 'subject1': "Python程序设计",
                         'subject2': "html基础", 'score1': "Python程序设计89", 'score2': "html基础77"},
                "1001 高等数学": {"SCORE": 78},
                "1001 珠宝设计": {"SCORE": 99},
                "1002 C语言成句设计": {"SCORE": 82},
                "1002 艺术鉴赏": {"SCORE": 67},
                "1003 离散数学": {"SCORE": 78},
                "1003 数据结构": {"SCORE": 99},
                "1004 Python程序设计": {"SCORE": 89},
                "1004 html基础": {"SCORE": 77},
                }

    print(students)
    print(" ------------------------")
elif n == 2:
    print(students['1001'])
    print(students['1001']['name'])
    print("-----------------------")

elif n == 3:
    xh = input("please input ID:")
    if xh in students:
        print(students[xh])
    else:
        print("not find")
        print("--------------------------")

elif n == 4:
    for k, v in students.items():
        print(k,v['nmae'], v['gender'], v['age'], v['score'])
        print("----------------------------------")

elif n == 5:
    cnt = {}
    xm = []
    for k, v in students.items():
        cnt[v['gender']] = cnt.get(v['gender'], 0) + 1
        if v['age'] > 18:
            xm.append(v['name'])
    print("female=%d male=%d" % (cnt['female'], cnt['male']))
    print(">18", xm)
    print("-----------------------------------------")

elif n == 6:
    MAX = max(students, key=lambda x: students[x]['score'])
    print(MAX)
    print(students[MAX])
    print("--------------------------------------")

elif n == 7:
    for c, d in students.items():
        print(c,d['name'],d['subject1'],d['subject2'])
        print("----------------------------------")

elif n == 8:
    for a, b in students.items():
        print(a, b['name'],b['score1'],b['score2'])

elif n==9:
    j=input(("请输入所查成绩学生姓名和科目："))
    if j in students:
        print(students[j])
    else:
        print("输入错误!")
        break

elif n == 10:
    break
else:
    print("输入错误！")
    print("-----------------------------------------------------------")
print("-----------程序运行结束--------------")

Answer 1

问题出在这儿，因为你这些for循环出来的只有前面几个是字典，后面的是字符串，那肯定会有问题的