docs: def emit(self, signal, *args):
          """
          Emits the given signal with the inputted args.  This will go through
          its list of connected callback slots and call them.
          
          :param      signal | <variant>
                      *args  | variables
          """
          callbacks = self._callbacks.get(signal, [])
          new_callbacks = []
          for callback in callbacks:
              # clear out deleted pointers
              if not callback.isValid():
                  continue
  
              new_callbacks.append(callback)
  
              try:
                  callback(*args)
              except StandardError:
                  logger.exception('Error occurred during callback.')
  
          self._callbacks[signal] = new_callbacks