__init__.py 文件源码

def http_session(self):
        """Returns a :class:`requests.Session` object. A new session is
        created if it doesn't already exist."""
        http_session = getattr(self, '_http_session', None)
        if not http_session:
            requests.packages.urllib3.disable_warnings()
            session = requests.Session()
            session.headers['User-Agent'] = USER_AGENT

            http_retry = Retry(total=5, status_forcelist=[500, 503],
                               backoff_factor=.5)
            http_adapter = HTTPAdapter(max_retries=http_retry)
            session.mount('http://', http_adapter)

            http_retry = Retry(total=5, status_forcelist=[500, 503],
                               backoff_factor=.5)
            http_adapter = HTTPAdapter(max_retries=http_retry)
            session.mount('https://', http_adapter)

            self._http_session = session

        return self._http_session