code: def _handle_waited_log(self, event: dict):
          
          txn_hash = event['transactionHash']
          event_name = event['event']
          assert event_name in self.event_waiting
          assert txn_hash in self.event_waiting[event_name]
  
          self.event_count[event_name][txn_hash] += 1
          event_entry = self.event_waiting[event_name][txn_hash]
  
          if event_entry.count == self.event_count[event_name][txn_hash]:
              self.event_waiting[event_name].pop(txn_hash)
  
          # Call callback function with event
          if event_entry.callback:
              event_entry.callback(event)
docs: A subroutine of handle_log
          Increment self.event_count, forget about waiting, and call the callback if any.