old_contents: # Copyright 2018 Google LLC
  #
  # Licensed under the Apache License, Version 2.0 (the 'License');
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #     http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an 'AS IS' BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  # [START functions_log_helloworld]
  import logging
  
  
  def hello_world(event, context):
      """Background Cloud Function.
      Args:
           event (dict): The dictionary with data specific to the given event.
           context (google.cloud.functions.Context): The Cloud Functions event
           context.
      """
      print('Hello, stdout!')
      logging.warn('Hello, logging handler!')
  # [END functions_log_helloworld]
  
new_contents: # Copyright 2018 Google LLC
  #
  # Licensed under the Apache License, Version 2.0 (the 'License');
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #     http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an 'AS IS' BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  # [START functions_log_helloworld]
  import logging
  
  
  def hello_world(data, context):
      """Background Cloud Function.
      Args:
           data (dict): The dictionary with data specific to the given event.
           context (google.cloud.functions.Context): The event metadata.
      """
      print('Hello, stdout!')
      logging.warn('Hello, logging handler!')
  # [END functions_log_helloworld]
  
subject: Update signature and docstring (#1593)