Description

PLY no longer writes table files or cached data, like the _lextab files we use. The API has changed significantly and is not obviously / easily adaptable to our current usage. Our version of PLY is 2 years old and works, but we might not be able to update, including for bug fixes, given the incompatibility.
Perhaps this should be an item for future dev-cons.

Additional context

See https://github.com/dabeaz/ply/blob/master/CHANGES.

PLY files are also not compatible with modern python syntax preferences ( #13396 )