def get_conn(self):
if not self._conn:<EOL><INDENT>http_authorized = self._authorize()<EOL>self._conn = build('<STR_LIT>', self.api_version,<EOL>http=http_authorized, cache_discovery=False)<EOL><DEDENT>return self._conn<EOL>
Retrieves connection to Google Compute Engine.

:return: Google Compute Engine services object
:rtype: dict