(self, state_change_callback=None)
Instance initializer.

    Args:
      state_change_callback: Callable invoked when action changes its state.
Instance initializer.
Instance initializer .
def __init__(self, state_change_callback=None):
    """Instance initializer.

    Args:
      state_change_callback: Callable invoked when action changes its state.
    """
    self._state_change_callback = state_change_callback
    self._watermark = None
def __init__ ( self , state_change_callback = None ) : self . _state_change_callback = state_change_callback self . _watermark = None