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by sn6uv 3533 days ago
We previously used ply but ran into a few issues:

The main issue was that generating the tables was extremely slow (~15mins). We solved this by packaging the tables, but when the version of ply changed a table regeneration was forced on our users.

The recursive descent parser was also simpler and significantly more performant.

There's a short write-up on the PR: https://github.com/mathics/Mathics/pull/416