code: def open(self, session, resource_name,
               access_mode=constants.AccessModes.no_lock, open_timeout=constants.VI_TMO_IMMEDIATE):
          
          raise NotImplementedError
docs: Opens a session to the specified resource.
  
          Corresponds to viOpen function of the VISA library.
  
          :param session: Resource Manager session (should always be a session returned from open_default_resource_manager()).
          :param resource_name: Unique symbolic name of a resource.
          :param access_mode: Specifies the mode by which the resource is to be accessed.
          :type access_mode: :class:`pyvisa.constants.AccessModes`
          :param open_timeout: Specifies the maximum time period (in milliseconds) that this operation waits
                               before returning an error.
          :return: Unique logical identifier reference to a session, return value of the library call.
          :rtype: session, :class:`pyvisa.constants.StatusCode`