def query_yes_no_quit(question, default="yes"):
    """Ask a yes/no/quit question via raw_input() and return their answer.
    
    "question" is a string that is presented to the user.
    "default" is the presumed answer if the user just hits <Enter>.
        It must be "yes" (the default), "no", "quit" or None (meaning
        an answer is required of the user).

    The "answer" return value is one of "yes", "no" or "quit".
    """
    valid = {"yes":"yes",   "y":"yes",    "ye":"yes",
             "no":"no",     "n":"no",
             "quit":"quit", "qui":"quit", "qu":"quit", "q":"quit"}
    if default == None:
        prompt = " [y/n/q] "
    elif default == "yes":
        prompt = " [Y/n/q] "
    elif default == "no":
        prompt = " [y/N/q] "
    elif default == "quit":
        prompt = " [y/n/Q] "
    else:
        raise ValueError("invalid default answer: '%s'" % default)

    while 1:
        sys.stdout.write(question + prompt)
        choice = raw_input().lower()
        if default is not None and choice == '':
            return default
        elif choice in valid.keys():
            return valid[choice]
        else:
            sys.stdout.write("Please respond with 'yes', 'no' or 'quit'.\n")