python实现学生管理系统

#!/usr/local/bin/python 
# -*- coding:utf-8 -*- 
 
import os 
import re 
 
#定义学生类 
class Student: 
 def __init__(self): 
  self.name = '' 
  self.ID = '' 
  self.score = 0 
 
#根据学生分数进行从大到小的冒泡排序 
def BuddleSortByScore( stulist ): 
 n = len( stulist ) 
 for i in range( n ): 
  for j in range( n - i - 1): 
   if stulist[j].score < stulist[j+1].score: 
    #tmp = stulist[j+1] 
    #stulist[j+1] = stulist[j] 
    #stulist[j] = tmp 
    stulist[j],stulist[j+1] = stulist[j+1],stulist[j] 
 
#按顺序输出所有学生的信息 
def PrintAllStudentInfo( stulist ): 
 print u"______________________学生列表_______________" 
 for i in range( len(stulist) ): 
  print u"姓名:" , 
  print stulist[i].name, 
  print " " , 
  print u"学号:" , 
  print stulist[i].ID , 
  print " " , 
  print u"分数：" , 
  print stulist[i].score 
 print "____________________________________________" 
 
#增加一个学生,增加成功返回True，否则返回False 
def Add( stulist , stu ): 
 if searchByID( stulist , stu.ID ) == 1: 
  print u"此ID已经存在！" 
  return False 
 stulist.append( stu ) 
 
 #给出是否保存更新数据的选择 
 print "Do you want to save the result " 
 nChoose = raw_input("Choose:Y/N:") 
  
 if nChoose == 'Y' or nChoose == 'y': 
  #将改变后的结果写入文件中,追加写文件 
  file_object = open("students.txt","a") 
  file_object.write( stu.ID ) 
  file_object.write( " " ) 
  file_object.write( stu.name ) 
  file_object.write( " " ) 
  file_object.write( str(stu.score) ) 
  file_object.write( "\r\n" ) 
  file_object.close() 
  return True 
 else: 
  stulist.remove(stu) 
 
#根据ID删除一个学生的信息，删除成功则返回True，否则返回false 
def DeleteByID( stulist , ID ): 
 for stu in stulist: 
  if stu.ID == ID: 
   stulist.remove( stu ) 
 
   #选择是否保存已经改变的内容 
   print "Do you want to save the changed result " 
   nChoose = raw_input("Choose:Y/N:") 
    
   if nChoose == 'Y' or nChoose == 'y': 
    file_object = open("students.txt" , "w+") 
    for stu2 in stulist: 
     file_object.write(stu2.ID) 
     file_object.write(" ") 
     file_object.write(stu2.name) 
     file_object.write(" ") 
     file_object.write(str(stu2.score)) 
     file_object.write("\r\n") 
    file_object.close() 
    print u"删除成功!" 
   return True 
 print u"删除失败!" 
 return False 
 
 
#根据姓名删除一个学生的信息，删除成功返回True,否则返回False 
def DeleteByName( stulist , name ): 
 pos = searchByName( stulist , name ) 
 if pos != -1: 
  del stulist[pos] 
 
  #选择是否保存已经改变的内容 
  print "Do you want to save the changed result " 
  nChoose = raw_input("Choose:Y/N:") 
    
  if nChoose == 'Y' or nChoose == 'y': 
    file_object = open("students.txt" , "w+") 
    for stu2 in stulist: 
     file_object.write(stu2.ID) 
     file_object.write(" ") 
     file_object.write(stu2.name) 
     file_object.write(" ") 
     file_object.write(str(stu2.score)) 
     file_object.write("\r\n") 
    file_object.close() 
    print u"删除成功!" 
  return True 
 else: 
  print u"删除失败!" 
  print pos 
  return False 
 
 
#根据学号查找一个学生是否存在,存在返回学生在列表中的下标，否则返回-1 
def searchByID( stulist , ID ): 
 for i in range( len(stulist) ): 
  if stulist[i].ID == ID: 
   print u"姓名：" , 
   print stulist[i].name , 
   print " " , 
   print u"学号:" , 
   print stulist[i].ID , 
   print " " , 
   print u"分数:" , 
   print stulist[i].score 
   return i 
 return -1 
 
#根据姓名查找一个学生是否存在，存在返回学生在列表中的下标,否则返回-1 
def searchByName( stulist , name ): 
 for i in range( len(stulist) ): 
  if stulist[i].name == name: 
   print u"姓名：" , 
   print stulist[i].name , 
   print " " , 
   print u"学号:" , 
   print stulist[i].ID , 
   print " " , 
   print u"分数:" , 
   print stulist[i].score 
   return i 
 return -1 
 
#初始化，读取文件，更新学生信息 
def Init( stulist ): 
 print u"初始化......" 
  
 file_object = open("students.txt","r") 
 
 #按行读取文件中学生的信息 
 for line in file_object: 
  stu = Student() 
  line = line.strip("\n") 
  s = line.split(" ") 
  stu.ID = s[0] 
  stu.name = s[1] 
  stu.score = s[2] 
  stulist.append(stu) 
 print u"初始化成功!" 
       
 
#查找菜单 
def QueryMenu( stulist ): 
 while True: 
  print "******************************" 
  print u"根据学生的学号进行查找-------1" 
  print u"根据学生的姓名进行查找-------2" 
  print u"离开查找模块----------------3" 
  print "******************************" 
 
  nChoose = raw_input("请输入你的选择") 
 
  if nChoose == "1": 
   ID = raw_input("请输入你要输入查找的ID:") 
   searchByID( stulist , ID ) 
  elif nChoose == "2": 
   name = raw_input("请输入你要查找的姓名:") 
   searchByName( stulist , name ) 
  elif nChoose == "3": 
   return 
  else: 
   print u"选择输入错误，请重新输入!" 
    
#删除模块 
def DeleteMenu( stulist ): 
 while True: 
  print "*****************************" 
  print u"根据学生的学号进行删除------1" 
  print u"根据学生的姓名进行删除------2" 
  print u"离开删除模块---------------3" 
  print "******************************" 
 
  nChoose = raw_input("请进行选择:") 
 
  if nChoose == "1": 
   ID = raw_input("请输入你要删除的ID:") 
   DeleteByID( stulist , ID ) 
  elif nChoose == "2": 
   name = raw_input("请输入你要删除的姓名:") 
   DeleteByName( stulist , name ) 
  elif nChoose == "3": 
   return 
  else: 
   print u"您的选择有误，请重新输入！" 
    
       
#菜单 
def menu( stulist ): 
 while True: 
  print "***********************" 
  print u"--------菜单------------" 
  print u"增加学生信息---------1" 
  print u"查找一个学生的信息----2" 
  print u"删除一个学生的信息----3" 
  print u"输出所有学生的信息----4" 
  print u"根据分数排序---------5" 
  print u"退出程序-------------6" 
  print "------------------------" 
  print "************************" 
 
  nChoose = raw_input("请输入你的选择:") 
   
  if nChoose == "1": 
   stu = Student() 
   stu.name = raw_input("请输入学生的姓名：") 
 
   #匹配学生ID是否满足0--9中的数字 
   while True: 
    stu.ID = raw_input("请输入学生的ID:") 
    #创建编译一个正则表达式的模板 
    p = re.compile( '^[0-9]{3}$' ) 
    if p.match( stu.ID ): 
     break 
    else: 
     print "学生的ID输入错误，正确形式应该为0--9之间的三位数字!" 
 
   #匹配学生的分数是否满足0--100之间 
   while True:  
    stu.score = eval( raw_input("请输入学生的分数：") ) 
    #利用普通的符号来判断分数是否符合标准 
    #if stu.score >= 0 and stu.score <= 100: 
    # break 
    #利用正则表达式来判断分数是否符合标准 
    if re.match( "^[0-9]" ,str(stu.score) ) and stu.score<=100 and    stu.score >= 0 : 
     break 
    else: 
     print u"分数不满足实际情况，应该为0--100之间的数字!" 
 
   if Add( stulist , stu ) == 1: 
    print u"学生信息增加成功!" 
   else: 
    print u"学生信息增加失败!" 
  elif nChoose == "2": 
   QueryMenu( stulist ) 
  elif nChoose == "3": 
   DeleteMenu( stulist ) 
  elif nChoose == "4": 
   PrintAllStudentInfo( stulist ) 
  elif nChoose == "5": 
   BuddleSortByScore( stulist ) 
 
   print "Do you want to save the sorted result" 
   choose = raw_input("please input your choice:Y/N:") 
   if choose == 'Y' or choose == 'y': 
    file_object = open("students.txt","w+") 
    for stu2 in stulist: 
     file_object.write(stu2.ID) 
     file_object.write(" ") 
     file_object.write(stu2.name) 
     file_object.write(" ") 
     file_object.write(str(stu2.score)) 
     file_object.write("\r\n") 
  elif nChoose == "6": 
   return 
  else: 
   print u"输入有误，请重新输入！" 
    
#测试函数部分 
if __name__ == '__main__': 
 #定义一个列表用来存储所有学生的信息 
 stulist = [] 
  
 #初始化，从文件中读取信息 
 Init( stulist ) 
  
 #菜单函数 
 menu( stulist )