old_contents: class Config:
      DEBUG = False
      TESTING = False
      REDIS = {
          'host': 'localhost',
          'port': 6379,
          'db': 0,
          'password': None
      }
      REDIS_KEY_EXPIRE = 604800  # a week in seconds
      IMAGE_DIR = './resources'
      LOG_FILE = 'app.log'
  
  class DevelopmentConfig(Config):
      DEBUG = True
  
  
  def load_config(app, flags):
      if 'dev' in flags:
          app.config.from_object('config.DevelopmentConfig')
      else:
          app.config.from_object('config.Config')
  
  def rotating_handler(filename):
      if filename.startswith('~'):
          filename = filename.replace('~', os.path.expanduser('~'))
      handler = RotatingFileHandler(filename, maxBytes=5242880, backupCount=2)
      formatter = Formatter('%(asctime)s [%(levelname)s] %(message)s', '%Y-%m-%d %H:%M:%S')
      handler.setFormatter(formatter)
      return handler
  
  def setup_logging(app):
      if not app.debug:
          from logging import Formatter
          from logging.handlers import RotatingFileHandler
          import logging
          filename = app.config['LOG_FILE']
          handler = rotating_handler(filename)
          handler.setLevel(logging.INFO)
          app.logger.addHandler(handler)
  
new_contents: from logging import Formatter
  from logging.handlers import RotatingFileHandler
  import logging
  
  class Config:
      DEBUG = False
      TESTING = False
      REDIS = {
          'host': 'localhost',
          'port': 6379,
          'db': 0,
          'password': None
      }
      REDIS_KEY_EXPIRE = 604800  # a week in seconds
      IMAGE_DIR = './resources'
      LOG_FILE = 'app.log'
  
  class DevelopmentConfig(Config):
      DEBUG = True
  
  
  def load_config(app, flags):
      if 'dev' in flags:
          app.config.from_object('config.DevelopmentConfig')
      else:
          app.config.from_object('config.Config')
  
  def rotating_handler(filename):
      if filename.startswith('~'):
          filename = filename.replace('~', os.path.expanduser('~'))
      handler = RotatingFileHandler(filename, maxBytes=5242880, backupCount=2)
      formatter = Formatter('%(asctime)s [%(levelname)s] %(message)s', '%Y-%m-%d %H:%M:%S')
      handler.setFormatter(formatter)
      return handler
  
  def setup_logging(app):
      if not app.debug:
          filename = app.config['LOG_FILE']
          handler = rotating_handler(filename)
          handler.setLevel(logging.INFO)
          app.logger.addHandler(handler)
  
subject: Move imports to top of file