old_contents: # Copyright 2016 Google Inc. All Rights Reserved.
  #
  # 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.
  
  import logging
  import os
  
  from flask import Flask
  import redis
  
  
  app = Flask(__name__)
  
  
  # [START client]
  redis_host = os.environ.get('REDIS_HOST', 'localhost')
  redis_port = int(os.environ.get('REDIS_PORT', 6379))
  redis_password = os.environ.get('REDIS_PASSWORD', None)
  redis_client = redis.StrictRedis(
      host=redis_host, port=redis_port, password=redis_password)
  # [END client]
  
  
  # [START example]
  @app.route('/')
  def index():
      # Set initial value if necessary
      if not redis_client.get('counter'):
          redis_client.set('counter', 0)
  
      value = redis_client.incr('counter', 1)
  
      return 'Value is {}'.format(value)
  # [END example]
  
  
  @app.errorhandler(500)
  def server_error(e):
      logging.exception('An error occurred during a request.')
      return """
      An internal error occurred: <pre>{}</pre>
      See logs for full stacktrace.
      """.format(e), 500
  
  
  if __name__ == '__main__':
      # This is used when running locally. Gunicorn is used to run the
      # application on Google App Engine. See entrypoint in app.yaml.
      app.run(host='127.0.0.1', port=8080, debug=True)
  
new_contents: # Copyright 2016 Google Inc. All Rights Reserved.
  #
  # 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.
  
  import logging
  import os
  
  from flask import Flask
  import redis
  
  
  app = Flask(__name__)
  
  
  # [START client]
  redis_host = os.environ.get('REDIS_HOST', 'localhost')
  redis_port = int(os.environ.get('REDIS_PORT', 6379))
  redis_password = os.environ.get('REDIS_PASSWORD', None)
  redis_client = redis.StrictRedis(
      host=redis_host, port=redis_port, password=redis_password)
  # [END client]
  
  
  # [START example]
  @app.route('/')
  def index():
      value = redis_client.incr('counter', 1)
      return 'Value is {}'.format(value)
  # [END example]
  
  
  @app.errorhandler(500)
  def server_error(e):
      logging.exception('An error occurred during a request.')
      return """
      An internal error occurred: <pre>{}</pre>
      See logs for full stacktrace.
      """.format(e), 500
  
  
  if __name__ == '__main__':
      # This is used when running locally. Gunicorn is used to run the
      # application on Google App Engine. See entrypoint in app.yaml.
      app.run(host='127.0.0.1', port=8080, debug=True)
  
subject: Reduce redis sample code.