new_contents: #! /usr/bin/python
  
  class Config:
      @staticmethod
      def init_app(app):
          pass
  
  
  class DevelopmentConfig(Config):
      DEBUG = True
  
  
  class TestingConfig(Config):
      TESTING = True
  
  
  class ProductionConfig(Config):
      pass
  
  
  config = {
      'development': DevelopmentConfig,
      'testing': TestingConfig,
      'production': ProductionConfig,
  
      'default': ProductionConfig
  }
  
subject: Add config.py