def login():
    userinfo = open("userinfo.txt","r")
    userinforec = userinfo.readline()
    username = ""
    username1 = input("What is your username?n")
    while userinforec != "":
        field = userinforec.split(",")
        username = field[0]
        password = field[1]
        name = field[2]
        age = field[3]
        year = field[4]
        mathseasy = field[5]
        mathsmed = field[6]
        mathshard = field[7]
        hiseasy = field[8]
        hismed = field[9]
        hishard = field[10]
        if username != username1:
           print("Error, username not found")
           break
        else:
            password1 = str(input("What is your password?n"))
            if password == password1:
                print("password accepted")
                writereport(username)
            else:
                print("Error, password not accepted")
                login()
            userinforec = userinfo.readline()
    main()
    userinfo.close()
    return username