What's the official way of storing settings for python programs?

Question

Django uses real Python files for settings, Trac uses a .ini file, and some other pieces of software uses XML files to hold this information.

Are one of these approa

Answer 1

For web applications I like using OS environment variables: os.environ.get('CONFIG_OPTION')

This works especially well for settings that vary between deploys. You can read more about the rationale behind using env vars here: http://www.12factor.net/config

Of course, this only works for read-only values because changes to the environment are usually not persistent. But if you don't need write access they are a very good solution.