S-expression toolkit in Python

sexpr is small and compact toolkit for working with s-expressions in Python. It provides: 1. Meta-syntax notation for grammar definition in YAML (similar to EBNF). 2. Validation of s-expressions against defined grammar. 3, Small and simple manipulation and rewriting framework. Want to get a feel for it? Check out README at github.com/IwoHerka/sexpr. Have a look at the documentation at sexpr.readthedocs.io/en/latest/.