def add_user():    filename=raw_input("你想保存到的文件名称为：")    fo=open(filename,"a")    print "请输入保存信息内容："        choise="y"    while choise=="y":        userdict={}        userlist=[]        name=raw_input("name:")        age=raw_input("age:")        sex=raw_input("sex:")        phone=raw_input("phone:")        userlist.append(age)        userlist.append(sex)        userlist.append(phone)        userdict[name]=userlist        content=str(userdict)        fo.write(content+‘\n‘)                choise=raw_input("是否继续?y/n:")    fo.close()    print "保存成功"    return filenamedef list_user():    filename=raw_input("你想查看的文件名称为：")    print "以下为所有学员信息："    fo=open(filename,"r")    content=fo.readlines()     for dic in content:        userdict=eval(dic)        name=userdict.keys()[0]        age=userdict.values()[0][0]        sex=userdict.values()[0][1]        phone=userdict.values()[0][2]        print "-"*20        print "name:", name        print "age:",age        print "sex:",sex        print "phone:",phone       fo.close()def search_user():    filename=raw_input("你想搜索的文件名称为：")    fo=open(filename,"r")    content=fo.readlines()       search_name=raw_input("你想查询信息的名字为：")    for dic in content:        userdict=eval(dic)        if search_name in userdict.keys()[0]:            age=userdict.values()[0][0]            sex=userdict.values()[0][1]            phone=userdict.values()[0][2]            print "-"*20            print "age:",age            print "sex:",sex            print "phone:",phone    fo.close()def modify_user():    filename=raw_input("你想修改的文件名称为：")    fo=open(filename,"r")    content=fo.readlines()     modify_name=raw_input("你想修改信息的名字为：")    for index, dic in enumerate(content):        userdict=eval(dic)        if userdict.keys()[0]==modify_name:            choise=int(raw_input("你想修改的信息为（0为年龄，1为性别，2为电话）："))            newcontent=raw_input("你想修改为：")            userdict.values()[0][choise]=newcontent            print "修改成功！"            content[index]=userdict              break    contentdict=content    fo=open(filename,"w")            for i in contentdict:        i=str(i)        fo.write(i+‘\n‘)    fo.close()def choice():      print"\n"    print "做一个选择:1，增加用户,2,用户列表,3,搜索用户,4,修改用户,5,退出!"    print"\n"        choice=raw_input("请做选择:")    if choice=="1":        add_user()    elif choice == "2":        list_user()    elif choice=="3":        search_user()    elif choice=="4":        modify_user()    elif choice=="5":        print‘DONE!‘        exit()    else:        print "请输入1-5之间的整数:"     choice()