(self)
Returns the actuation actions applied in the previous step.

    Concrete walker implementations should provide caching mechanism themselves
      in order to access this observable (for example, through `apply_action`).
Returns the actuation actions applied in the previous step.
Returns the actuation actions applied in the previous step .
def prev_action(self):
    """Returns the actuation actions applied in the previous step.

    Concrete walker implementations should provide caching mechanism themselves
      in order to access this observable (for example, through `apply_action`).
    """
    raise NotImplementedError
def prev_action ( self ) : raise NotImplementedError