student1

student_list=[]
def add():
    name = input('请输入一个学员的姓名：')
    student_list.append(name)
    print()

def update():
    for x in range(0, len(student_list)):
        name = student_list[x]
        print('序号为：%s 姓名为：%s' % (x, name))
    index = input('请选择要修改的学员的序号：')
    index = int(index)
    while index not in range(0, len(student_list)):
        index = input('您输入的序号不存在，请重新输入：')
        index = int(index)
    name = student_list[index]
    new_name = input('请输入修改后的学员的姓名（%s）：' % name)
    student_list[index] = new_name
    print()

def select():
    for x in range(0, len(student_list)):
        name = student_list[x]
        print('序号：%s  姓名：%s' % (x, name))


def delete():
    for x in range(0,len(student_list)):
        name=student_list[x]
        print('序号为：%s 姓名为：%s' % (x, name))
    index = input('请选择要删除的学员的序号：')
    index = int(index)
    while index not in range(0, len(student_list)):
        index = input('您输入的序号不存在，请重新输入：')
        index = int(index)
    del student_list[index]
    print()


while True:
    print('1.添加学员', '\t', '2.修改学员', '\t', '3.查询学员', '\t', '4.删除学员', '\t', '0.退出程序')
    print()
    # 选择操作
    num = input('请输入您要做的操作：')
    num = int(num)
    while num not in range(0, 5):
        num = input('您的选择不存在，请重新选择：')
        num = int(num)
    if num==1:
        add()
    elif num==2:
        update()
    elif num==3:
        select()
    elif num==4:
        delete()
    elif num==0:
        break