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()