protocol_loop.py 文件源码

def from_url(self, url):
        """extract host and port from an URL string"""
        parts = urlparse.urlsplit(url)
        if parts.scheme != "loop":
            raise SerialException(
                'expected a string in the form '
                '"loop://[?logging={debug|info|warning|error}]": not starting '
                'with loop:// ({!r})'.format(parts.scheme))
        try:
            # process options now, directly altering self
            for option, values in urlparse.parse_qs(parts.query, True).items():
                if option == 'logging':
                    logging.basicConfig()   # XXX is that good to call it here?
                    self.logger = logging.getLogger('pySerial.loop')
                    self.logger.setLevel(LOGGER_LEVELS[values[0]])
                    self.logger.debug('enabled logging')
                else:
                    raise ValueError('unknown option: {!r}'.format(option))
        except ValueError as e:
            raise SerialException(
                'expected a string in the form '
                '"loop://[?logging={debug|info|warning|error}]": {}'.format(e))

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