#显示主菜单
def show_menu():
   print('欢迎进入千峰学生管理系统'.center(20, '='))
   print('1.添加学生')
   print('2.删除学生')
   print('3.修改信息')
   print('4.查找信息')
   print('q.退出')
   print('=' * 20)

#1.添加学生
def add_student():
   student_list = []
   while True:
       with open('./student.txt','r',encoding='utf-8') as f:
           content = f.read()

       name1 = input('请输入学生的姓名:')
       age1 = input('请输入学生的年龄:')
       phone1 = input('请输入学生的电话:')
       dict1 = {'name': name1,  'age': age1, 'phone': phone1}
       student_list.append(dict1)
       f = open('./student.txt', 'w', encoding='utf-8')
       f.write(str(dict1)+'\n')
       f.close()
       print('=' * 20)
       print('添加成功!!!')
       print('1.继续添加')
       print('2.返回上层')
       print('=' * 20)
       x1 = int(input('请选择:'))
       if x1 == 1:
           continue
       else:
           show_menu()
           x2 = int(input('请选择:'))
           if x2 == 1:
               add_student()
           elif x2 == 2:
               del_student()
           elif x2 == 3:
               change_student()
           elif x2 == 4:
               find_student()
           else:
               print('欢迎下次使用')
               break
#2.删除学生
def del_student():
   while True:
       name2 = input('请输入要删除的学生姓名:')
       with open('./student.txt','r',encoding='utf-8') as f:
           student_list = eval(f.read())
       print(student_list)
       for student in student_list:
           if student['name'] == name2:
               student_list.remove(student)
           print(student_list)
           with open('./student.txt','r',encoding='utf-8') as f:
               content = f.write(str(student_list))
           print('删除成功')
           print('=' * 20)
           print('1.继续删除')
           print('2.退出')
           print('=' * 20)
           x1 = int(input('请选择:'))
           if x1 == 1:
               continue
           else:
               show_menu()
               x2 = int(input('请选择:'))
               if x2 == 1:
                   add_student()
               elif x2 == 2:
                   del_student()
               elif x2 == 3:
                   change_student()
               elif x2 == 4:
                   find_student()
               else:
                   print('欢迎下次使用')
                   break
#3.修改信息
def change_student():
   while True:
       with open('./student.txt','r',encoding='utf-8') as f:
           student_list = eval(f.read())
       print(student_list)
       name3 = input('请输入要修改的姓名:')
       for student in student_list:
           if name3 == student['name']:
               print('=' * 20)
               print(student)
               print('=' * 20)
               print('1.修改年龄')
               print('2.修改电话')
               x3 = input('请选择:')
               if x3 == 1:
                   age2 = input('请输入修改后的年龄:')
                   student['age']= age2
                   print('修改成功')
               else:
                   tel2 = input('请输入修改后的电话')
                   student['tel'] = tel2
                   print('修改成功')
               with open('./student.txt', 'r',encoding='utf-8') as f:
                   content = f.write(str(student_list))

       print('1.继续修改')
       print('2.退出')
       x1 = int(input('请选择:'))
       if x1 == 1:
           continue
       else:
           show_menu()
           x2 = int(input('请选择:'))
           if x2 == 1:
               add_student()
           elif x2 == 2:
               del_student()
           elif x2 == 3:
               change_student()
           elif x2 == 4:
               find_student()
           else:
               print('欢迎下次使用')
               break
#4.查找信息
def find_student():
   while True:
       with open('./student.txt','r',encoding='utf-8') as f:
           student_list = eval(f.read())
       print('1.按姓名查找')
       print('1.按年龄查找')
       print('1.按电话查找')
       print('=' * 20)
       x4 = int(input('请选择:'))
       print('=' * 20)
       if x4 == 1:
           name4 = input('请输入要查找的学生姓名:')
           for student in student_list:
               if name4 == student['name']:
                   print(student)
                   print('=' * 20)
           print('1.继续查找')
           print('2.退出')
           print('=' * 20)
           x4 = int(input('请选择:'))
           if x4 == 1:
               continue
           else:
               show_menu()
               x2 = int(input('请选择:'))
               if x2 == 1:
                   add_student()
               elif x2 == 2:
                   del_student()
               elif x2 == 3:
                   change_student()
               elif x2 == 4:
                   find_student()
               else:
                   print('欢迎下次使用')
                   break
       elif x4 == 2:
           age4 = input('请输入要查找的学生年龄:')
           for student in student_list:
               if student['age'] == age4:
                   print(student)
                   print('=' * 20)
           print('1.继续查找')
           print('2.退出')
           print('=' * 20)
           x4 = int(input('请选择:'))
           if x4 == 1:
               continue
           else:
               show_menu()
               x2 = int(input('请选择:'))
               if x2 == 1:
                   add_student()
               elif x2 == 2:
                   del_student()
               elif x2 == 3:
                   change_student()
               elif x2 == 4:
                   find_student()
               else:
                   print('欢迎下次使用')
                   break
       elif x4 == 3:
           tel4 = input('请输入查找的学生电话:')
           for student in student_list:
               if student['tel'] == tel4:
                   print(student)
                   print('=' * 20)
           print('1.继续查找')
           print('2.退出')
           print('=' * 20)
           x4 = int(input('请选择:'))
           if x4 == 1:
               continue
           else:
               show_menu()
               x2 = int(input('请选择:'))
               if x2 == 1:
                   add_student()
               elif x2 == 2:
                   del_student()
               elif x2 == 3:
                   change_student()
               elif x2 == 4:
                   find_student()
               else:
                   print('欢迎下次使用')
                   break
#运行
while True:
   show_menu()
   number1 = int(input('请选择:'))
   if number1 == 1:
       add_student()
   elif number1 == 2:
       del_student()
   elif number1 == 3:
       change_student()
   elif number1 == 4:
       find_student()
   elif str(number1) == 'q':
       print('退出系统')
       break