I need to store configurations (key/value) for a Python application and I am searching for the best way to store these configurations in a file.

I run into Python's [ConfigParser](http://docs.python.org/library/configparser.html) and I wondered if the INI file format is really still appropriate nowadays?!
Does there exist a more up-to-date format or is INI still the recommended way to go? (XML, JSON, ...)

Please share your opinions/recommendations...