```name_list = [] # 存储学生信息字典，学生信息用字典存，再用列表存储字典
 
 
# 菜单
def display_menu():
 print("-"*30)
 print(" 学生管理系统 v8.8 ")
 print("1.添加学生信息")
 print("2.删除学生信息")
 print("3.修改学生信息")
 print("4.查询单个学生信息")
 print("5.查询所有学生信息")
 print("6.退出系统")  
 print("-"*30)
 
 
# 选择序号的获得
def get_choice():
 selected_key = input("请输入选择的序号：")
 return selected_key
 
 
# 检查性别是否合法
def check_sex(new_sex):
 flag = True
 while flag:
 if new_sex == '男' or new_sex == '女':
  flag = False
 else:
  new_sex = input("输入性别有误，请重新输入(男/女)：")
 return new_sex
 
 
# 检查电话号码是否合法
def check_phone(new_phone):
 flag = True
 while flag:
 if new_phone.isdigit():
  flag = False
 else:
  new_phone = input("您输入的电话号码有误，请重新输入：")
 return new_phone
 
 
# 检查学号是否重复或者有误
def check_id(new_id):
 flag = True
 while flag:
 # 先检查是不是纯数字再去考虑是否重复的事情，如果不是纯数字直接pass
 if new_id.isdigit():
  for i in range(len(name_list)):
  if name_list[i]['id'] == new_id:
   new_id = check_id(input("您输入的学号重复，请重新输入："))
  flag = False
 else:
  new_id = input("您输入的学号有误，请重新输入：")
 return new_id
 
 
# 添加学生信息
def add_name():
 new_info = {}
 new_id = check_id(input("请输入学号："))
 new_info['id'] = new_id
 new_name = input("请输入姓名：")
 new_info['name'] = new_name
 new_sex = check_sex(input("请输入性别(男/女)："))
 new_info['sex'] = new_sex
 new_phone = check_phone(input("请输入电话号码："))
 new_info['phone'] = new_phone
 name_list.append(new_info)
 print("添加成功！")
 
 
# 查询所有学生信息
def find_all():
 print("="*30)
 for name in name_list:
 print(name['id'], name['name'], name['sex'], name['phone'])
 print("=" * 30)
 
 
# 删除学生信息
def del_name():
 del_id_is = input("请输入要删除的学生学号：")
 flag = False
 index = 0
 for i in range(len(name_list)):
 if name_list[i]['id'] == del_id_is:
  flag = True
  index = i
  break
 if flag:
 name_list.pop(index)
 print("删除成功！")
 else:
 print("学生未找到！请检查学号输入是否有误！")
 
 
# 名字修改细节函数
def choice_of_name(index):
 while True:
 choice = input("请输入要修改学生的(1.id 2.姓名 3.性别 4.电话号码，5.全部修改)：")
 if choice == '5':
  new_id = input("请输入新的学号：")
  name_list[index]['id'] = new_id
  new_name = input("请输入新的姓名：")
  name_list[index]['name'] = new_name
  new_sex = check_sex(input("请输入性别(男/女)："))
  name_list[index]['sex'] = new_sex
  new_phone = check_phone(input("请输入电话号码："))
  name_list[index]['phone'] = new_phone
  break
 elif choice == '1':
  new_id = input("请输入新的学号：")
  name_list[index]['id'] = new_id
  break
 elif choice == '2':
  new_name = input("请输入新的姓名：")
  name_list[index]['name'] = new_name
  break
 elif choice == '3':
  new_sex = check_sex(input("请输入性别(男/女)："))
  name_list[index]['sex'] = new_sex
  break
 elif choice == '4':
  new_phone = check_phone(input("请输入电话号码："))
  name_list[index]['phone'] = new_phone
  break
 else:
  print("输入有误，请重新输入！")
 
 
# 修改学生信息
def re_name():
 id_is = input("请输入要修改的学生学号：")
 flag = False
 index = 0
 # 先找到要修改的学生的下标
 for i in range(len(name_list)):
 if name_list[i]['id'] == id_is:
  flag = True
  index = i
  break
 if flag:
 choice_of_name(index)
 print("修改成功！")
 else:
 print("修改失败，学生信息未找到！")
 
 
# 查询单个学生信息
def find_name():
 find_id_is = input("请输入要查询的学生学号：")
 flag = False
 index = 0
 for i in range(len(name_list)):
 if name_list[i]['id'] == find_id_is:
  flag = True
  index = i
  break
 if flag:
 print("学生查询到，学生信息为：")
 print(name_list[index]['id'], name_list[index]['name'], name_list[index]['sex'], name_list[index]['phone'])
 else:
 print("学生未找到！")
 
 
def main():
 exit_name = True
 while exit_name:
 display_menu()
 key = get_choice()
 if key == '1':
  add_name()
 elif key == '2':
  del_name()
 elif key == '3':
  re_name()
 elif key == '4':
  find_name()
 elif key == '5':
  find_all()
 elif key == '6':
  exit_name = False
 else:
  print("请输入正确的数值！")
 
 
main()