day08-提高作业（控制台学生管理系统）

完成一个控制台学生管理系统，要求能实现查看所有学生的学号、姓名、年龄、电话，并且能根据学号和姓名进行查询，能修改学生的信息，能删除学生信息

all_students = [
{'no':'stu001','name':'stu1','age':18,'phone':'1811111111111'},
{'no':'stu002','name':'stu2','age':20,'phone':'1811111100000'},
{'no':'stu003','name':'stu3','age':22,'phone':'1811111100011'}]

wellcome = """
========================================
欢迎进入学生管理系统：
   ❤ 1.  添加学生
   ❤ 2.  查看学生
   ❤ 3.  修改学生信息
   ❤ 4.  删除学生
   ❤ 5.  退出
========================================
请输入（1-5）:
"""
wellcome2 = """
1. 查看所有学生
2. 按姓名查找
3. 按学号查找
4. 返回
"""

while True:
    menu =int(input(wellcome))
    if menu == 1:
        sub_menu = 1
        while sub_menu != 2:
            name = input("请输入学生姓名：")
            age = input("请输入学生年龄：")
            phone = input("请输入学生电话：")
            no = 'stu%03d' % (len(all_students) + 1)
            student = {
                'no':no,
                'name':name,
                'age':int(age),
                'phone':phone
            }
            all_students.append(student)
            print("添加成功！")
            sub_menu =int(input("1. 继续\n2. 返回\n请选择(1-2):")) 
    elif menu == 2:
        sub_menu = int(input(wellcome2))
        while sub_menu!=4:
            if sub_menu == 1:
                for student in all_students:
                    print("学号：%s\t姓名：%s\t年龄：%d\t电话：%s" % (student["no"],student["name"],student["age"],student["phone"]))
            elif sub_menu == 2:
                name = input("请输入要查找的姓名：")
                for student in all_students:
                    if student["name"]== name:
                        print("学号：%s\t姓名：%s\t年龄：%d\t电话：%s" % (student["no"],student["name"],student["age"],student["phone"]))
            elif sub_menu == 3:
                no = input("请输入要查找的学号：")
                for student in all_students:
                    if student["no"]== no:
                        print("学号：%s\t姓名：%s\t年龄：%d\t电话：%s" % (student["no"],student["name"],student["age"],student["phone"]))
                        break
                else:
                    print("查无此人")
            sub_menu = int(input(wellcome2))
            
    elif menu == 3:
        sub_menu = 1
        while sub_menu != 2:
            no = input("请输入要修改的学生学号：")
            for student in all_students:
                if student["no"]== no:
                    name = input("请输入学生姓名：")
                    age = input("请输入学生年龄：")
                    phone = input("请输入学生电话：")

                    student["name"] = name
                    student["age"] = int(age)
                    student["phone"] = phone
                    break
            else:
                print("查无此人")
            print("修改成功")
            sub_menu = int(input("1. 继续\n2. 返回\n请选择(1-2):"))
    elif menu == 4:
        sub_menu = 1
        while sub_menu != 2:
            no = input("请输入要删除的学生学号：")
            for student in all_students[:]:
                if student["no"]== no:
                    all_students.remove(student)
                    break
            else:
                print("查无此人")
            print("删除成功")
            sub_menu = int(input("1. 继续\n2. 返回\n请选择(1-2):"))
    else:
        print("Bye~")
        break