old_contents: import logging
  from flask import Flask
  
  app = Flask(__name__)
  logging.basicConfig()
  logger = logging.getLogger(__name__)
  logger.setLevel(logging.DEBUG)
  
  @app.route('/', methods=['GET', 'POST'])
  def lambda_handler(event=None, context=None):
      logger.info('Lambda function invoked index()')
  
      return 'hello from Flask!'
  
  if __name__ == '__main__':
      app.run(debug=True)
  
new_contents: import logging
  from flask import Flask
  
  app = Flask(__name__)
  logging.basicConfig()
  logger = logging.getLogger(__name__)
  logger.setLevel(logging.DEBUG)
  
  @app.route('/', methods=['GET', 'POST'])
  def lambda_handler(event=None, context=None):
      logger.info('Lambda function invoked index()')
  
      return 'Flask says Hello!!'
  
  if __name__ == '__main__':
      app.run(debug=True)
  
subject: Update app.py