学生管理系统 Python语言

def show_student():
    print(('*'*20).center(55))
    print('1.添加学生信息'.center(50))
    print('2.修改学生信息'.center(50))
    print('3.删除学生信息'.center(50))
    print('4.查询学生信息'.center(50))
    print('5.退出信息系统'.center(50))
    print('6.显示学生信息'.center(50))
    print(('*'*20).center(55))

def add_student():
    a_name = input('please input the student name : ')
    a_sex = input('please input the the sex :')
    a_height = input('please input the height：')
    add_diclt = {'name':a_name ,'sex':a_sex ,'height':a_height}
    sum_list.append(add_diclt)
    return sum_list
def alter_student():
    al1 = 0
    alte = input('please input the alter the student message name :')
    for al in range(len(sum_list)):
        if sum_list[al]['name'] == alte :
            print(sum_list[al])
            al1 = al
        else:
            if al == len(sum_list)-1:
                print('do not find the student name ')
                exit()
            continue

    a_name = input('please input the student name : ')
    a_sex = input('please input the the sex :')
    a_height = input('please input the height：')
    add_diclt = {'name':a_name ,'sex':a_sex ,'height':a_height}
    sum_list.insert(al1,add_diclt)
    sum_list.pop(al1+1)
    return sum_list
def del_student():
    dll = 0
    de_name = input('please input the del the student message name :')
    for dl in range(len(sum_list)):
        if sum_list[dl]['name'] == de_name:
            print(sum_list[dl])
            dll = dl
        else:
            if dl == len(sum_list)-1:
                print('do not exit')
                exit()
            continue
    sum_list.pop(dll)
    print('删除成功！')
    return sum_list
def find_student():
    find_name = input('please input the find the student message name :')
    for f1 in range(len(sum_list)):
        if sum_list[f1]['name'] == find_name:
            print(sum_list[f1])
        else:
            if f1 == len(sum_list)-1:
                print('not find your input the name .please input continue')
                find_student()
            continue
    return sum_list

def main_student():
    while 1:
     show_student()
     s1 = input('please input the number:')
     if s1 == '1':
         print(add_student())
     if s1 == '2':
         print(alter_student())
     if s1 == '3':
         del_student()
     if s1 == '4':
         find_student()
     if s1 == '5':
         print('是否退出，如果退出输入y，如果继续，输入n ')
         e1 = input('<<<')
         if e1.upper() == 'y':
             exit()
         else:
             show_student()
     if s1 == '6':
         print(sum_list)

sum_list = []       #总列表
lis1 = ['deng','123','taibai','123456','alex','2019','jing','2017']
lis2 = []
i = 3
while i > 0:
    username = input('please input the username :')
    password = input('please input the password : ')
    if username in lis1[0::2] and password in lis1[1::2] :
        print('验证成功...')
        lis2.append(username)
        lis2.append(password)
        break
    else:
        i -= 1
        print('验证失败，请再次尝试，您还有'+str(i)+'次机会')
        continue
if i == 0:
    exit()
print('欢迎{name}进入学生管理系统'.format(name = lis2[0]))
main_student()