def _setup(self, name=None):
envvar = self.__dict__['<STR_LIT>']<EOL>if envvar:<EOL><INDENT>settings_file = os.environ.get(envvar)<EOL><DEDENT>else:<EOL><INDENT>settings_file = self.__dict__['<STR_LIT>']<EOL><DEDENT>if not settings_file:<EOL><INDENT>msg = ("<STR_LIT>"<EOL>"<STR_LIT>"<EOL>"<STR_LIT>")<EOL>logger.error(msg)<EOL>raise OSError(msg)<EOL><DEDENT>self._wrapped = Settings(settings_file)<EOL>
Load the settings module referenced by env_var. This environment-
defined configuration process is called during the settings
configuration process.