import os
def printwindows():
 print('='*30)
 print('學(xué)生信息管理系統(tǒng)V1.0')
 print('1.添加學(xué)生信息')
 print('2.刪除學(xué)生信息')
 print('3.修改學(xué)生信息')
 print('4.顯示所有學(xué)生信息')
 print('5.保存數(shù)據(jù)')
 print('0.退出系統(tǒng)')
 print('='*30)
students = []
def add_student():
 while 1:
 os.system("cls")
 student = []
 student_name = input("請(qǐng)輸入學(xué)生姓名：")
 student_id = input("請(qǐng)輸入學(xué)生學(xué)號(hào)：")
 student_xingbie = input("請(qǐng)輸入學(xué)生性別：")
 student_age = input("請(qǐng)輸入學(xué)生年齡：")
 student_pione = input("請(qǐng)輸入學(xué)生電話：")
 student.append(student_name)
 student.append(student_id)
 student.append(student_xingbie)
 student.append(student_age)
 student.append(student_pione)
 students.append(student)
 n = input("是否繼續(xù)添加？y or n:")
 if n == "n":
  break
def del_student():
 while 1:
 del_student_id = input("請(qǐng)輸入要?jiǎng)h除的學(xué)生學(xué)號(hào)：")
 for student in students:
  if student[1] == del_student_id:
  del student
  print("刪除成功！")
  break
 n = input("是否繼續(xù)添加？y or n:")
 if n == "n":
  break
def updata_student():
 while 1:
 updata_student_id = input("請(qǐng)輸入你要更改的學(xué)生學(xué)號(hào)：")
 for student in students:
  if student[1] == updata_student_id:
  flag = input("選擇你要更改的學(xué)生信息：1.姓名，2.學(xué)號(hào)，3.性別，4.年齡，5.電話:")
  if flag == 1:
   name = input("請(qǐng)輸入你要換成的名字：")
   student[0] = name
  elif flag == 2:
   student_id = input("請(qǐng)輸入你要換成的學(xué)號(hào)：")
   student[1] = student_id
  elif flag == 3:
   student_xinbie = input("請(qǐng)輸入你要換成的性別:")
   student[2] = student_xinbie
  elif flag == 4:
   student_age = input("請(qǐng)輸入你要換成的年齡：")
   student[3] = student_age
  elif flag == 5:
   student_pione = input("請(qǐng)輸入你要換成的電話:")
   student[4] = student_pione
  else :
   pass 
 n = input("是否繼續(xù)添加？y or n:")
 if n == "n":
  break
def show_student():
 print(" 學(xué)生信息")
 print("姓名 學(xué)號(hào) 性別 年齡 電話")
 for student in students:
 print(student[0] + " " + student[1] + " " + student[2] + " " + student[3] + " " + student[4])
 os.system("pause") 
def read_in_file():
 with open("student_data.txt", 'a') as f:
 for student in students:
  f.write(student[0] + " " + student[1] + " " + student[2] + " " + student[3] + " " + student[4] + '\n')
 print("保存成功！")
def main():
 while(1):
 os.system("cls")
 printwindows()
 print("請(qǐng)輸入你要執(zhí)行的代碼：")
 n = int(input())
 if n == 1:
  add_student()
 elif n == 2:
  del_student()
 elif n == 3:
  updata_student()
 elif n == 4:
  show_student()
 elif n == 5:
  read_in_file()
 else:
  break
if __name__ == '__main__':
 main()