学生成绩管理系统

students = []
num = 0
while num != 'q':
    print('欢迎进入学生管理系统')
    print('1.添加学生')
    print('2.查找学生')
    print('3.删除学生')
    print('q.退出系统')
    num = input('>>>')
    while num == '1':
        temp = []
        name = input('请输入学生姓名：')
        age = int(input('请输入学生年龄：'))
        tel = int(input('请输入学生电话号码：'))
        temp.append(name)
        temp.append(age)
        temp.append(tel)
        students.append(temp)
        print('1.继续添加学生')
        print('2.返回上一层')
        num1 = int(input('>>>'))
        if num1 == 2 or num1 != 1:
            num = '9'
    while num == '2':
        print('1.查看所有学生信息')
        print('2.根据名字查看学生信息')
        print('3.返回上一层')
        num1 = int(input('>>>'))
        if num1 == 1:
            for x in range(len(students)):
                print('name:%s age:%d tel:%d' % (students[x][0],students[x][1],students[x][2]))
        elif num1 == 2:
            name = input('请输入要查看的学生姓名：')
            for x in range(len(students)):
                if name == students[x][0]:
                    print('name:%s age:%d tel:%d' % (students[x][0], students[x][1], students[x][2]))
        elif num1 == 3 or num1 != 1 or num1 != 2:
            num = '9'
    while num == '3':
        name = input('请输入要删除的学生姓名：')
        label = True
        for x in range(len(students)):
            if name == students[x][0]:
                label = False
                print(x,'name:%s age:%d tel:%d' % (students[x][0],students[x][1],students[x][2]))
            if label:
                print('输入姓名错误！')
                print('1.继续删除')
                print('2.返回上一层')
                num1 = int(input('>>>'))
                if num1 == 1:
                    continue
                if num1 == 2 or num1 != 1:
                    num = '9'
        index = int(input('请输入要删除学生的下标：'))
        del students[index]
        print('删除成功！')
        print('1.继续删除')
        print('2.返回上一层')
        num1 = int(input('>>>'))
        if num1 == 2 or num1 != 1:
            num = '9'
print(students)