num = 0
student_name = {}
student_name1 = {}
student_number = {}
student_name_number = {}
student_number_name = {}
while num == 0:
    print('     1.  添加学生')
    print('     2.  查看学生')
    print('     3.  修改学生信息')
    print('     4.  删除学生')
    print('     5.  返回')
    num = int(input('请选择（1-5）：'))
    while num == 1:
        name_value = input('请输入姓名：')
        age_value = input('请输入年龄：')
        phone_value = input('请输入电话：')
        stu_number = input('请输入学号:')
        student_name_number[name_value] = stu_number
        student_number_name[stu_number] = name_value
        student_name1['姓名'] = name_value
        student_name1['年龄'] = age_value
        student_name1['电话'] = phone_value
        student_name1['学号'] = stu_number
        student_name[name_value] = student_name1
        student_number[stu_number] = student_name1
        print('添加成功！')
        print('1.继续')
        print('2.返回')
        num = int(input('请选择（1-2）：'))
        if num == 2:
            num = 0
            break
    while num == 2:
        print('     1.  查看所有学生')
        print('     2.  按姓名查找')
        print('     3.  按学号查找')
        print('     4.  返回')
        num = int(input('请选择（1-4）：'))
        if num == 1:
            for key in student_name:
                print(key, student_name[key])
            print('查找成功')
            num = 2
            continue
        if num == 2:
            name_value = input('请输入姓名：')
            if name_value in student_name:
                print(student_name[name_value])
                print('查找成功')
        if num == 3:
            stu_number = input('请输入学号：')
            if stu_number in student_number:
                print(student_number[stu_number])
                print('查找成功')
            num = 2
        if num == 4:
            num = 0
            break
    while num == 3:
        name_value = input('请输入姓名：')
        age_value = input('请输入年龄：')
        phone_value = input('请输入电话：')
        stu_number = input('请输入学号:')
        if name_value in student_name_number and student_name_number[name_value] != stu_number:
            print('名字与学号不对应！')
            num = 0
            continue
        if stu_number in student_number_name and student_number_name[stu_number] == name_value:
            print('学号与名字不对应！')
            num = 0
            continue
        student_name1['姓名'] = name_value
        student_name1['年龄'] = age_value
        student_name1['电话'] = phone_value
        student_name1['学号'] = stu_number
        student_name[name_value] = student_name1
        student_number[stu_number] = student_name1
        print('修改成功！')
        print('1.继续')
        print('2.返回')
        num = int(input('请选择（1-2）：'))
        if num == 1:
            num = 3
        if num == 2:
            num = 0
            break
    while num == 4:
        name_value = input('请输入姓名：')
        stu_number = input('请输入学号:')
        del student_name[name_value]
        del student_number[stu_number]
        print('删除成功！')
        num = 0
    if num == 5:
        break
print('退出系统！')

运行：

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