protocol_alt.py 文件源码

def serial_class_for_url(url):
    """extract host and port from an URL string"""
    parts = urlparse.urlsplit(url)
    if parts.scheme != 'alt':
        raise serial.SerialException('expected a string in the form "alt://port[?option[=value][&option[=value]]]": not starting with alt:// (%r)' % (parts.scheme,))
    class_name = 'Serial'
    try:
        for option, values in urlparse.parse_qs(parts.query, True).items():
            if option == 'class':
                class_name = values[0]
            else:
                raise ValueError('unknown option: %r' % (option,))
    except ValueError as e:
        raise serial.SerialException('expected a string in the form "alt://port[?option[=value][&option[=value]]]": %s' % e)
    return (''.join([parts.netloc, parts.path]), getattr(serial, class_name))

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