code: def create(cls, config_file=None):
          
          if cls.instance is None:
              cls.instance = cls(config_file)
  
              # Load config file, possibly overwriting the defaults
              cls.instance.load_ini()
  
          if config_file and config_file != cls.instance.config_file:
              raise RuntimeError("Configuration initialized a second time with a different file!")
  
          return cls.instance
docs: Return the default configuration.