python学生管理系统学习笔记

import re
student=[]
 
def appendStudentInfo():
 studentinfo={"Name":"","ID":"","语文":"","数学":"","英语":"","总分":""}
 studentinfo["Name"]=input("请输入学生姓名：")
 idflag=True
 while idflag:
  studentinfo["ID"] = input("请输入学生学号：")
  pattern=re.compile("^\d{3}$")
  if not re.match(pattern,studentinfo["ID"]) :
   print("输入错误，请重新输入")
   idflag = True
  if querystudent(studentinfo["ID"])==True:
   print("该学号已经存在请重新输入")
   idflag = True
  if querystudent(studentinfo["ID"])==False and re.match(pattern,studentinfo["ID"]):
   idflag = False
 
 studentinfo["语文"]=input("请输入语文成绩：")
 while not studentinfo["语文"].isdigit() or int(studentinfo["语文"])>100 or int(studentinfo["语文"])<0:
  studentinfo["语文"] = input("输入错误，请重新输入：")
 
 studentinfo["数学"]=input("请输入数学成绩：")
 while not studentinfo["数学"].isdigit() or int(studentinfo["数学"]) > 100 or int(studentinfo["数学"]) < 0:
  studentinfo["数学"] = input("输入错误，请重新输入：")
 
 studentinfo["英语"]=input("请输入英语成绩：")
 while not studentinfo["英语"].isdigit() or int(studentinfo["英语"]) > 100 or int(studentinfo["英语"]) < 0:
  studentinfo["英语"] = input("输入错误，请重新输入：")
 
 studentinfo["总分"]=int(studentinfo["语文"])+int(studentinfo["英语"])+int(studentinfo["数学"])
 student.append(studentinfo)
 
def delstudent():
 delstudentid = input("请输入要删除的学生学号：")
 flag =False
 for item in student:
  if item["ID"]==delstudentid:
   flag = True
   print("要删除学生的相关信息如下：")
   print(item)
   select=input("是否删除：是(Y)/否（N）")
   if select=="Y" or select=="y":
    student.remove(item)
    print("删除成功")
   elif select =="N" or select=="n":
    print("取消删除")
   else:
    print("输入错误")
 if flag ==False:
  print("未搜索到该学生")
 
def querystudent(querystudentid):
 flag=False
 for item in student:
  if item["ID"]==querystudentid:
   flag=True
 return flag
 
def modifystudentifo():
 delstudentid = input("请输入要修改的学生学号：")
 
 flag=False
 for item in student:
  if item["ID"]==delstudentid:
   print("查询内容如下：")
   print(item)
   flag=True
   while True:
    modifymenu = input("请输入修改选项：1、姓名，2、语文成绩，3、数学成绩，4、英语成绩，5、退出")
    while not modifymenu.isdigit():
     modifymenu = input("输入错误，请重新输入：")
    if int(modifymenu)==1:
     item["Name"] = input("请重新输入学生姓名：")
    elif int(modifymenu)==2:
     item["语文"] = input("请重新输入学生语文成绩：")
    elif int(modifymenu)==3:
     item["数学"] = input("请重新输入学生数学成绩：")
    elif int(modifymenu)==4:
     item["英语"] = input("请重新输入学生英语成绩：")
    elif int(modifymenu) == 5:
     break
    else:
     print("输入序号无效")
   item["总分"] = int(item["语文"]) + int(item["英语"]) + int(item["数学"])
   print("修改结果如下：")
   print(item)
 
 if flag ==False:
  print("未搜索到该学生")
 
def allinfo():
 for item in student:
  print(item)
 
def iteminfo(querystudentid):
 for item in student:
  if item["ID"]==querystudentid:
   print("查询内容如下：")
   print(item)
 
def studentMenu():
 print("="*30)
 print("学生管理系统")
 print("1、添加学生信息")
 print("2、删除学生信息")
 print("3、查询学生信息")
 print("4、修改学生信息")
 print("5、显示所有学生信息")
 print("6、退出")
 print("="*30)
 
 
if __name__ == '__main__':
 
 while True:
  studentMenu()
  menuindex = input("请输入选项序号：")
  while not menuindex.isdigit():
   menuindex = input("输入错误，请重新输入：")
  if int(menuindex) ==1:
   appendStudentInfo()
  elif int(menuindex) ==2:
   delstudent()
  elif int(menuindex) ==3:
   querystudentid = input("请输入要查询的学生学号：")
   if querystudent(querystudentid) == True:
    iteminfo(querystudentid)
   else:print("未搜索到该学生")
  elif int(menuindex) ==4:
   modifystudentifo()
  elif int(menuindex)== 5:
   allinfo()
  elif int(menuindex) == 6:
   break
  else:
   print("输入序号无效")