message: Resolve linter warnings in autofl.tff
diff: import os
  -from pprint import pprint
  -from typing import Any, List, Optional, Tuple
  import numpy as np
  import tensorflow as tf
  @@ -14,8 +12,7 @@ PARTITIONS = 3
  def main():
  tf.compat.v1.enable_v2_behavior()
  -
  tff.federated_computation(lambda: "Hello, World!")()
  - emnist_train, emnist_test = tff.simulation.datasets.emnist.load_data()
  + emnist_train, _ = tff.simulation.datasets.emnist.load_data()
  l = len(emnist_train.client_ids)
  print(l)
  