lean4
kuroko
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lean4 | kuroko | |
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53 | 11 | |
3,714 | 403 | |
4.7% | - | |
9.9 | 8.8 | |
7 days ago | about 1 month ago | |
Lean | Python | |
Apache License 2.0 | MIT License |
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
lean4
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Dafny is a verification-aware programming language
Recently replaced by Lean, though.
https://github.com/cedar-policy/cedar-spec
https://lean-lang.org
- The Mechanics of Proof
- Natural Deduction in Logic (2015)
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The Wizardry Frontier
Nice read! Rust has pushed, and will continue to push, the limits of practical, bare metal, memory safe languages. And it's interesting to think about what's next, maybe eventually there will be some form of practical theorem proving "for the masses". Lean 4 looks great and has potential, but it's still mostly a language for mathematicians. There has been some research on AI constructed proofs, which could be the best of both worlds because then the type checker can verify that the AI generated code/proof is indeed correct. Tools like Kani are also a step forward in program correctness.
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Lean4 helped Terence Tao discover a small bug in his recent paper
Yeah, I believe they said intend for it to be used as a general purpose programming language. I used it to complete Advent of Code last year.
There are some really interesting features for general purpose programming in there. For example: you can code updates to arrays in a functional style (change a value, get a new array back), but if the refcount is 1, it updates in place. This works for inductive types and structures, too. So I was able to efficiently use C-style arrays (O(1) update/lookup) while writing functional code. (paper: https://arxiv.org/abs/1908.05647 )
Another interesting feature is that the "do" blocks include mutable variables and for loops (with continue / break / return), that gets compiled down to monad operations. (paper: https://dl.acm.org/doi/10.1145/3547640 )
And I'm impressed that you can add to the syntax of the language, in the same way that the language is implemented, and then use that syntax in the next line of code. (paper: https://lmcs.episciences.org/9362/pdf ). There is an example in the source repository that adds and then uses a JSX-like syntax. (https://github.com/leanprover/lean4/blob/master/tests/playgr... )
- A Linguagem Lua completa 30 anos!
- Lean 4.0
- Lean 4.0.0, first official lean4 release
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Looking to start a new community for people who want to use code for everything
My latest inspiration to use code to a) replace my video editor, b) learn the basics of EDM production and c) understand a few topics in higher maths. This might sound very strange given there are specialised tools for these jobs. There's iMovie / Adobe Premier for video, there's GarageBand and FL studio for music and old good pen and pencil for math proofs. But these tools have three big limitations. First they have a lot of idiosyncratic learning, you have to spend quite some time getting used to these tools and my experience is that this time is quite upsetting. In contrast, you only have to learn to code one, maybe spend a few hours getting used to the syntax of another language. I'm not sure if that's true for most people but it was true for me using the tools mentioned above and wanted a place to discuss and see other people ideas and experiments. The second issue is that all these custom-made tools, are not composing easily. I can't search for all math proofs that used a single theorem. I can't create a plugin for iMovie and apply it to all my videos. I can't pick easily pick a rhythm from the internet and build upon for fun. There's also the issue of costs and version control, all tools I'm using today are open source and my work is stored in my repositories. This way I can create branches and test my ideas and I'm also confident that I can work in these projects in years.
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In Which I Claim Rich Hickey Is Wrong
Dafny and Whiley are two examples with explicit verification support. Idris and other dependently typed languages should all be rich enough to express the required predicate but might not necessarily be able to accept a reasonable implementation as proof. Isabelle, Lean, Coq, and other theorem provers definitely can express the capability but aren't going to churn out much in the way of executable programs; they're more useful to guide an implementation in a more practical functional language but then the proof is separated from the implementation, and you could also use tools like TLA+.
https://dafny.org/
https://whiley.org/
https://www.idris-lang.org/
https://isabelle.in.tum.de/
https://leanprover.github.io/
https://coq.inria.fr/
http://lamport.azurewebsites.net/tla/tla.html
kuroko
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Is there a way to do a C style For loop in Python ? (for i=start; i< end; i++)...
(kuroko)[https://github.com/kuroko-lang/kuroko] is basically Python, but C
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Kuroko: Python, but scoped
Kuroko: Dialect of Python with explicit variable declaration and block scoping, with a lightweight and easy-to-embed bytecode compiler and interpreter.
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What is your favourite programming language? (other than Scala)
I would say Kuroko makes more sense ;-P
- GitHub - kuroko-lang/kuroko: Dialect of Python with explicit variable declaration and block scoping, with a lightweight and easy-to-embed bytecode compiler and interpreter.
- GitHub – kuroko-lang/kuroko: Dialect of Python
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August 2022 monthly "What are you working on?" thread
Kuroko 1.3.0 gets a release candidate. Lots of big things since 1.2.5, like optimized method invocation, more operator overloads, better support for f-string expressions (format specs, =, faster constructions), a long type with my own bigint implementation (this was the last thing I was still regularly opening Python repls for, so a huge personal win). I also fixed a bunch of little things that have been nagging me, like the compiler can now compile expressions directly, which allowed me to remove the kludge that made the repl work previously. The WASM web repl also got some love with a port of the core of Hiwire from Pyodide, giving a very straightforward interface between JS and Kuroko in a browser - and I rebuilt the web IDE on it. I've also been working on a new compiler, which will hopefully form the basis of 2.0 - and this might be the last 1.x release (though I expect at least a few 1.3.x bug fix releases).
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Announcing: PonyOS 8
In case it's not clear, PonyOS is a joke reskin of my serious OS project, ToaruOS. PonyOS gets a new release every April 1st. All of the libraries and applications in ToaruOS are in-house things I built myself - the whole OS is "built from scratch". PonyOS adds ponysay, which is an external app originally written in Python - and in previous releases of PonyOS I shipped the Python version alongside a port of Python 3.6. This release, though, comes with a port to my own language, Kuroko, which is a dialect of Python - a lot of what went into building the PonyOS release this year was getting ponysay to work well.
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January 2022 monthly "What are you working on?" thread
Did this year's Advent of Code in Kuroko which sussed out some bugs and missing functionality. Better hashing for tuples, more builtins and methods on standard classes for improved compatibility with Python, general build cleanups. In the later problems, most suffering was caused by the GC, so I'd like to put more thought into collection strategies going forward.
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In search of a Python-like language potentially seen here recently
Is it me you're looking for?
- April 2021 monthly "What are you working on?" thread
What are some alternatives?
z3_tutorial - Jupyter notebooks for tutorial on the Z3 SMT solver
python-compiler - A Python bytecode compiler written in Python. This repository is now a fork of https://github.com/facebookincubator/python-compiler, upstream is there.
coq - Coq is a formal proof management system. It provides a formal language to write mathematical definitions, executable algorithms and theorems together with an environment for semi-interactive development of machine-checked proofs.
xvm - Ecstasy and XVM
Agda - Agda is a dependently typed programming language / interactive theorem prover.
delta - C* is a hybrid low-level/high-level systems programming language focused on performance and productivity.
ATS-Postiats - ATS2: Unleashing the Potentials of Types and Templates
The-Spiral-Language - Functional language with intensional polymorphism and first-class staging.
ts-sql - A SQL database implemented purely in TypeScript type annotations.
yasl - Bytecode Interpreter for Yet Another Scripting Language (YASL).
roc - A fast, friendly, functional language. Work in progress!
aulang - simple and fast scripting language