Python Help. Need to verify username password off csv file : Doing a python project where I have to verify my username and password from a csv file where the first two rows and columns have the username and password as 'hi'. Please help ASAP.
Current Code: 

    answer = input("Do you have an account?(yes or no) ")
    if answer == 'yes' :
       login = False
       csvfile = open("Username password.csv","r")
       reader = csv.reader('Username password.csv')
       username = input("Player One Username: ")
       password = input("Player One Password: ")
       for row in reader:
            if row[0]== username and row[1] == password:
               login = True
            else:
               login = False
       if login == True:
          print("Incorrect. Game Over.")
          exit()
       else:
          print("You are now logged in!")
    else:
       print('Only Valid Usernames can play. Game Over.')
       exit()