(self)
Open a persistent backend session that allows reusing HTTP
		connections between individual HTTP requests.
		
		It is an error to call this function if a session is already open.
Open a persistent backend session that allows reusing HTTP
		connections between individual HTTP requests.
		
		It is an error to call this function if a session is already open.
Open a persistent backend session that allows reusing HTTP connections between individual HTTP requests . It is an error to call this function if a session is already open .
def open_session(self) -> None:
		"""Open a persistent backend session that allows reusing HTTP
		connections between individual HTTP requests.
		
		It is an error to call this function if a session is already open."""
		assert self._session is None
		self._session = self._make_session()
def open_session ( self ) -> None : assert self . _session is None self . _session = self . _make_session ( )