def getparser(use_datetime=0):
    """getparser() -> parser, unmarshaller

    Create an instance of the fastest available parser, and attach it
    to an unmarshalling object.  Return both objects.
    """
    if use_datetime and not datetime:
        raise ValueError("the datetime module is not available")
    if FastParser and FastUnmarshaller:
        if use_datetime:
            mkdatetime = _datetime_type
        else:
            mkdatetime = _datetime
        target = FastUnmarshaller(True, False, _binary, mkdatetime, Fault)
        parser = FastParser(target)
    else:
        target = Unmarshaller(use_datetime=use_datetime)
        if FastParser:
            parser = FastParser(target)
        elif SgmlopParser:
            parser = SgmlopParser(target)
        elif ExpatParser:
            parser = ExpatParser(target)
        else:
            parser = SlowParser(target)
    return parser, target
getparser() -> parser, unmarshaller

    Create an instance of the fastest available parser, and attach it
    to an unmarshalling object.  Return both objects.