GitHub - lark-parser/lark: Lark is a parsing toolkit for Python, built with a focus on ergonomics, performance and modularity.
Lark is a parsing toolkit for Python, built with a focus on ergonomics, performance and modularity. Lark can parse all context-free languages. To put it simply, it means that it is capable of parsing almost any programming language out there, and to some degree most natural languages too. Who is it for? Beginners: Lark is very friendly for experimentation. It can parse any grammar you throw at it,
Baby's first type checker
Austin Z. Henley Associate Teaching Professor Carnegie Mellon University Baby's first type checker 8/31/2025 See the discussion of this post on Hacker News. Have you ever wondered how type checking works? Me too—let's make one! Python allows optional type annotations like this: def foobar(name: str | None) -> str: return "Fizz!" buzz: int = 42 A type checker goes through the code to make sure that
Following up on the Python JIT
Performance of Python programs has been a major focus of development for the language over the last five years or so; the Faster CPython project has been a big part of that effort. One of its subprojects is to add an experimental just-in-time (JIT) compiler to the language; at last year's PyCon US, project member Brandt Bucher gave an introduction to the copy-and-patch JIT compiler. At PyCon US 20
Reflections on 2 years of CPython’s JIT Compiler—The good, the bad, the ugly
Ken Jin's Blog Reflections on 2 years of CPython’s JIT Compiler: The good, the bad, the ugly 5 July 2025 This blog post includes my honest opinions on the CPython JIT. What I think we did well, what I think we could have done better. I’ll also do some brief qualititative analysis. I’ve been working on CPython’s JIT compiler since before the very start. I don’t know how long that is at this point …
10. Full Grammar specification
10. Full Grammar specification¶ This is the full Python grammar, derived directly from the grammar used to generate the CPython parser (see Grammar/python.gram). The version here omits details related to code generation and error recovery. The notation used here is the same as in the preceding docs, and is described in the notation section, except for an extra complication: ~ (“cut”): commit to th
leontrolski - adding Python syntax
⇦ 2024-10-17 Adding syntax to the cpython interpreter Condensed version of this cool blog post. Let's add some new syntax to Python! Making a small change is not so hard. Our aim is to make ternary statements default to None as they do in Ruby: >>> "hello" if 2 + 2 == 4 "hello" >>> "hello" if 2 + 2 == 5 None In existing Python, we get an error: File "<python-input-0>", line 1 "hello" if 2 + 2 == 5
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Baby's first type checker
Dynamic Region Ownership for Concurrency Safety - Microsoft Research
Following up on the Python JIT
Decorator JITs - Python as a DSL - Eli Bendersky's website
Decorator JITs - Python as a DSL
cpython/InternalDocs/changing_grammar.md at main · python/cpython
CPython’s internals
cpython/Grammar/python.gram at main · python/cpython
Changing CPython’s grammar
How I Patched Python to Include This Ruby Feature
Adding syntax to the CPython interpreter | Hacker News