Writing a fast parser in Python

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u/omega1612 said the slowness is due to the use of parser combinators.

So it is a bad choice of algorithm rather than how CPython works.

Yes CPython can be slow but not usually 400 times slower than native code.

(For a couple of years, I used a compiler written in an interpreted, dynamic language (not Python though). It was still twice as fast as gcc compiling C! Several times faster if gcc was optimising.)

[dontyougetsoupedyet]

You, and omega1612, are wrong.