old_contents: # Copyright 2015 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 pylibmc
  
  app = Flask(__name__)
  
  
  # [START client]
  # Environment variables are defined in app.yaml.
  if os.environ.get('USE_GAE_MEMCACHE'):
      MEMCACHE_SERVER = ':'.join(
          os.environ.get('GAE_MEMCACHE_HOST', 'localhost'),
          os.environ.get('GAE_MEMCACHE_PORT', 11211))
  else:
      MEMCACHE_SERVER = os.environ.get('MEMCACHE_SERVER', 'localhost:11211')
  
  MEMCACHE_USERNAME = os.environ.get('MEMCACHE_USERNAME')
  MEMCACHE_PASSWORD = os.environ.get('MEMCACHE_PASSWORD')
  
  memcache_client = pylibmc.Client(
      [MEMCACHE_SERVER], binary=True,
      username=MEMCACHE_USERNAME, password=MEMCACHE_PASSWORD)
  # [END client]
  
  
  # [START example]
  @app.route('/')
  def index():
  
      # Set initial value if necessary
      if not memcache_client.get('counter'):
          memcache_client.set('counter', 0)
  
      value = memcache_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 2015 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 pylibmc
  
  app = Flask(__name__)
  
  
  # [START client]
  # Environment variables are defined in app.yaml.
  if os.environ.get('USE_GAE_MEMCACHE'):
      MEMCACHE_SERVER = ':'.join([
          os.environ.get('GAE_MEMCACHE_HOST', 'localhost'),
          os.environ.get('GAE_MEMCACHE_PORT', '11211')])
  else:
      MEMCACHE_SERVER = os.environ.get('MEMCACHE_SERVER', 'localhost:11211')
  
  MEMCACHE_USERNAME = os.environ.get('MEMCACHE_USERNAME')
  MEMCACHE_PASSWORD = os.environ.get('MEMCACHE_PASSWORD')
  
  memcache_client = pylibmc.Client(
      [MEMCACHE_SERVER], binary=True,
      username=MEMCACHE_USERNAME, password=MEMCACHE_PASSWORD)
  # [END client]
  
  
  # [START example]
  @app.route('/')
  def index():
  
      # Set initial value if necessary
      if not memcache_client.get('counter'):
          memcache_client.set('counter', 0)
  
      value = memcache_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: Fix memcache sample