Hi. I wrote the python implementation. I've had prior experience with compilers and I'm obviously biased but I would say it's quite readable. The main compiler part (without optional features or the LR(1) or lexer generator) is 2040 lines and contains very little magic. It would be easy to translate 1-1 to idiomatic C++ for instance - it would just be much more verbose. eval() is only used by the lexer generator. The metaprogramming could have been avoided by using dataclasses (but the marker used python 3.5).

(To be clear, the optional portions in which I implement SSA, various optimizations, a Hack-style allocator and some ad-hoc codegen is much less readable.)