YAML may be the most human friendly format for structured data invented so far.

YAML examples and usage in notable Python apps

YAML is a feature-overcrept language. Most packages below use its subset.

• tmuxp - http://tmuxp.readthedocs.org/en/latest/examples.html

• ansible - http://www.ansibleworks.com/docs/YAMLSyntax.html and http://www.ansibleworks.com/docs/playbooks.html#id9

• appengine - https://developers.google.com/appengine/docs/python/config/appconfig and http://code.google.com/p/rietveld/source/browse/app.yaml

• salt - http://docs.saltstack.com/topics/tutorials/starting_states.html#default-data-yaml

Full YAML parsers

PyYAML - http://pyyaml.org/ - due to complexity of YAML spec, this is the only package that tried to be compliant. It is C-based.

Parsers for YAML subsets

Luckily, you may not need the full YAML spec. These libraries can parse only the sweetest parts of YAML spec that you may reuse in your configs.