code: def _write_container_output(output_itr, stdout=None, stderr=None):
          
  
          # Iterator returns a tuple of (frame_type, data) where the frame type determines which stream we write output
          # to
          for frame_type, data in output_itr:
  
              if frame_type == Container._STDOUT_FRAME_TYPE and stdout:
                  # Frame type 1 is stdout data.
                  stdout.write(data)
  
              elif frame_type == Container._STDERR_FRAME_TYPE and stderr:
                  # Frame type 2 is stderr data.
                  stderr.write(data)
  
              else:
                  # Either an unsupported frame type or stream for this frame type is not configured
                  LOG.debug("Dropping Docker container output because of unconfigured frame type. "
                            "Frame Type: %s. Data: %s", frame_type, data)
docs: Based on the data returned from the Container output, via the iterator, write it to the appropriate streams
  
          Parameters
          ----------
          output_itr: Iterator
              Iterator returned by the Docker Attach command
          stdout: samcli.lib.utils.stream_writer.StreamWriter, optional
              Stream writer to write stdout data from Container into
          stderr: samcli.lib.utils.stream_writer.StreamWriter, optional
              Stream writer to write stderr data from the Container into