code: def flush(self):
          
          if len(self.rows) != 0:
              self.table.mutate_rows(self.rows)
              self.total_mutation_count = 0
              self.total_size = 0
              self.rows = []
docs: Sends the current. batch to Cloud Bigtable.
          For example:
  
          .. literalinclude:: snippets.py
              :start-after: [START bigtable_batcher_flush]
              :end-before: [END bigtable_batcher_flush]