lihaoyi/macropy on Hacker News

I actually implemented something of this sorts back in college: MacroPy https://github.com/lihaoyi/macropy

comment by lihaoyi · 2025-11-29 · in PEP 638 – Syntactic Macros

You can make macros in Python: https://github.com/lihaoyi/macropy (note that that project was started for a class taught by Sussman) There's also a PEP to make them first-class: https://peps.python.org/pep-0638/

comment by Y_Y · 2025-05-30 · in On eval in dynamic languages generally and in Racket specifically (2011)

…Hissp. https://www.gnu.org/software/m4/ https://threeofwands.com/algebraic-data-types-in-python/ https://github.com/lihaoyi/macropy https://github.com/gilch/hissp

comment by gilch · 2024-11-23 · in Ask HN: What are the nice feature you need in a programming language?

Maybe MacroPy? https://github.com/lihaoyi/macropy

comment by uyt · 2021-02-25 · in Python for Lisp Programmers (2000)

…of metaprogramming are already there, it just takes some libraries to put them on your fingertips https://github.com/lihaoyi/macropy The "LISP is homoiconic" trope is oversimplified; the Python stdlib gives access to the compiler, parse…

comment by PaulHoule · 2020-09-26 · in Python Enhancement Proposal 638 – Syntactic Macros

Not unless there was an older repo that is now gone: https://github.com/lihaoyi/macropy/graphs/contributors https://github.com/hylang/hy/graphs/contributors It looks like macropy started around 6 months after Hy, around a time when Hy had…

comment by tekacs · 2020-05-16 · in Macropy: Syntactic Macros for Python

https://github.com/lihaoyi/macropy

comment by sitkack · 2020-05-06 · in Python goto implemented with system trace function (2017)

…mutation one can inflict upon the runtime is magnificent! http://farmdev.com/src/secrets/framehack/ https://github.com/lihaoyi/macropy

comment by sitkack · 2019-08-15 · in Rust 1.37.0

Another one? https://github.com/lihaoyi/macropy

comment by klibertp · 2018-09-13 · in Bowler: Safe code refactoring for modern Python

…to parse conventional languages down to an AST tree, work on the tree, and run that code. See https://github.com/lihaoyi/macropy Sometimes I wonder if the LISP cult is just trying to pretend Noam Chomsky was never born.

comment by PaulHoule · 2018-02-16 · in Just what does “code as data” mean anyway? (2014)

…while using them is pretty cool, I don't think the implementation of the macros is very nice. [1] https://github.com/lihaoyi/macropy

comment by icebraining · 2018-02-15 · in Homoiconicity isn’t the point (2012)

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MacroPy: Syntactic Macros for Python

story by pmoriarty · 2017-10-12 · 0 comments

…don't need to write a parser, btw, because the stdlib provides one for you (in `ast` module). [1] https://github.com/lihaoyi/macropy

comment by klibertp · 2017-06-29 · in Fantastic DSLs and where to find them

…https://github.com/lampepfl/dotty/issues/2491 and https://github.com/lihaoyi/Scalite and (say) https://github.com/lihaoyi/macropy . [1]: Properties in Python also have the underlying design of using descriptors, which are a whole other…

comment by tekacs · 2017-05-27 · in Warts of Scala

I think you would be very pleased with and interested in macropy. https://github.com/lihaoyi/macropy

comment by canjobear · 2016-09-10 · in Changing Python lambda syntax at runtime

…for "case" classes that produce objects with a similar behavior to "attr.s" generated objects https://github.com/lihaoyi/macropy

comment by d0mine · 2016-08-26 · in Using attrs for everything in Python

…much more extensive things. 1. https://tomforb.es/automatically-inline-python-function-call... 2. https://github.com/lihaoyi/macropy

comment by orf · 2016-01-25 · in Use JSON files as if they are Python modules

https://github.com/lihaoyi/macropy

comment by mycelium · 2015-09-08 · in Lisp is still a secret weapon

…that it's not the most impressive example of what you can do with macros (see my other post). [0]: https://github.com/lihaoyi/macropy#skeletons-in-the-closet

comment by davidshepherd7 · 2015-05-26 · in Macros in Python: quasiquotes, case classes, LINQ and more

…3.4 support is not quite ready [0], and attempting to install it with `pip3` just fails. [0]: https://github.com/lihaoyi/macropy/issues/32

comment by davidshepherd7 · 2015-05-26 · in Macros in Python: quasiquotes, case classes, LINQ and more

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Macros in Python: quasiquotes, case classes, LINQ and more

story by mzl · 2015-05-26 · 18 comments

…I am not sure anyone has ever seriously used this ability. It certainly isn't main stream. Checkout https://github.com/lihaoyi/macropy for inspiration. Norvig agrees with this assessment: http://norvig.com/python-lisp.html . Given that…

comment by timtadh · 2014-11-10 · in Half a decade with Go

Sweet.js ( http://sweetjs.org ) and MacroPy ( https://github.com/lihaoyi/macropy ) come to mind. Actually "real macros" are just macros which operate on AST instead of on strings, they are hard to do if you have to re-implement language…

comment by klibertp · 2014-08-15 · in Why don't I metaprogram more?

…repeated "defs", though. Here's another approach based on Macropy (basically, macros for Python): https://github.com/lihaoyi/macropy#pattern-matching .

comment by unignorant · 2014-08-03 · in Pun: A small library to enable pattern matching in JavaScript and CoffeeScript

Oh yes, you can. But once you're doing that, why stop at a single statement? Why not macros https://github.com/lihaoyi/macropy

comment by anon4 · 2014-03-15 · in Replacing `import` with `accio`: A Dive into Bootstrapping and Python's Grammar

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Macros in Python: quasiquotes, case classes, LINQ and more

story by luu · 2013-12-18 · 0 comments

Indeed you can https://github.com/lihaoyi/macropy

comment by anonymous · 2013-11-09 · in Pyret: A new programming language from the creators of Racket

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Macros in Python: quasiquotes, case classes, LINQ and more

story by llambda · 2013-10-14 · 0 comments

…algebraic data types and to perform pattern matching. This is the closest thing i found for that: https://github.com/lihaoyi/macropy

comment by neur0mancer · 2013-10-13 · in Functional Python Made Easy

Most code don't need __setattr__ level of magic https://github.com/lihaoyi/macropy (search for "Levels of Magic")

comment by d0mine · 2013-08-20 · in Guido van Rossum Deconstructing Twisted's Deferreds

…this point since most of the features are there. [1] http://docs.python.org/3/library/ast.html [2] https://github.com/lihaoyi/macropy

comment by StefanKarpinski · 2013-08-14 · in Metaprogramming – Julia Language

if you like to play with the AST, I think you could find useful https://github.com/lihaoyi/macropy

comment by _ZeD_ · 2013-08-07 · in Automatically inline Python function calls

> Can you add macros to python Yes https://github.com/lihaoyi/macropy

comment by anonymous · 2013-06-25 · in Rarely Asked Questions

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MacroPy's Hygienic Macros in Python

story by lihaoyi · 2013-06-08 · 4 comments

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MacroPy Parser Combinators, now with a complete JSON parser in 50 lines of code

story by lihaoyi · 2013-06-03 · 0 comments

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A Fully-compliant JSON parser using MacroPy's Parser Combinators

story by lihaoyi · 2013-06-03 · 0 comments

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JS Snippets: Cross compiling snippets of Python to Javascript

story by lihaoyi · 2013-05-20 · 0 comments

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Writing your first Macro in Python

story by lihaoyi · 2013-05-18 · 0 comments

Author here, I just put up a Detailed Guide: https://github.com/lihaoyi/macropy#detailed-guide That goes into more detail of how macros are written, and walks you through writing a simple but useful macro (the quicklambda macro). This…

comment by lihaoyi · 2013-05-13 · in Macros in Python

Yep, there's an issue for that! https://github.com/lihaoyi/macropy/issues/14 I've also gotten a basic implementation working in the CPython REPL, which requires you to run a function `macro_repl()` before you can use them. A Macro powered…

comment by lihaoyi · 2013-05-13 · in Macros in Python

It's actually pretty simple and almost all in this file: https://github.com/lihaoyi/macropy/blob/master/macropy/core/... Those already familiar with the imp mechanism and AST module could probably infer it from the description. An…

comment by tekacs · 2013-05-13 · in Macros in Python

…give a TL;DR on the whole library, but case classes can be used with for example pattern matching ( https://github.com/lihaoyi/macropy#pattern-matching ). The following code: with patterns: Foo(x, Bar(3, z)) << Foo(4, Bar(3, 8)) The…

comment by asm89 · 2013-05-13 · in Macros in Python

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Macros in Python

story by lihaoyi · 2013-05-13 · 66 comments

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LINQ to SQL, in Python

story by lihaoyi · 2013-05-11 · 0 comments

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Macros in Python: quasiquotes, case classes, LINQ and more

story by lihaoyi · 2013-05-08 · 2 comments

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Writing a JSON parser in Python