code: def list_trials(experiment_path, sort, output, filter_op, columns,
                  result_columns):
      
      if columns:
          columns = columns.split(",")
      if result_columns:
          result_columns = result_columns.split(",")
      commands.list_trials(experiment_path, sort, output, filter_op, columns,
                           result_columns)
docs: Lists trials in the directory subtree starting at the given path.