parameters: (self, transfer_id)
docstring: Notify a particular transfer is complete
  
          :param transfer_id: Unique identifier for the transfer
docstring_summary: Notify a particular transfer is complete
docstring_tokens: Notify a particular transfer is complete
function: def notify_done(self, transfer_id):
          """Notify a particular transfer is complete
  
          :param transfer_id: Unique identifier for the transfer
          """
          self._transfer_states[transfer_id].set_done()
function_tokens: def notify_done ( self , transfer_id ) : self . _transfer_states [ transfer_id ] . set_done ( )