Guido van Rossum's series on PEG parsing
https://medium.com/@gvanrossum_83706/peg-parsing-series-de5d...
Proposal to use PEG parser in python https://www.python.org/dev/peps/pep-0617/
Python PEG grammar https://github.com/python/cpython/blob/3.9/Grammar/python.gr...