(self, watermark)
Begins the action, signing it with the specified watermark.
Begins the action, signing it with the specified watermark.
Begins the action signing it with the specified watermark .
def begin(self, watermark):
    """Begins the action, signing it with the specified watermark."""
    if self._watermark is None:
      self._watermark = watermark
      if self._state_change_callback is not None:
        self._state_change_callback(watermark)
def begin ( self , watermark ) : if self . _watermark is None : self . _watermark = watermark if self . _state_change_callback is not None : self . _state_change_callback ( watermark )