    def __init__(self, screen, start_frame=0, stop_frame=0, delete_count=None):
        """
        :param screen: The Screen that will render this Effect.
        :param start_frame: Start index for the effect.
        :param stop_frame: Stop index for the effect.
        :param delete_count: Number of frames before this effect is deleted.
        """
        self._screen = screen
        self._start_frame = start_frame
        self._stop_frame = stop_frame
        self._delete_count = delete_count
        self._scene = None
:param screen: The Screen that will render this Effect.
:param start_frame: Start index for the effect.
:param stop_frame: Stop index for the effect.
:param delete_count: Number of frames before this effect is deleted.
asciimatics/effects.py