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Statically typed Python
7 projects | reddit.com/r/Python | 30 Nov 2021
Facebook/Instagram uses Pyre which is a typechecker for Python.
facebook/pyre-check - Performant type-checking for python.
1 project | reddit.com/r/GithubSecurityTools | 16 Oct 2021
OCaml at Bloomberg 'we use OCaml to write DSLs and production services –'
2 projects | news.ycombinator.com | 23 Aug 2021
I'd be curious if the pyre-check compilation is any faster for you either by removing the inlining optimization flag (the `-Oclassic` here https://github.com/facebook/pyre-check/blame/36243764ab81a82...) or whether there's a way to compile pyre-check to bytecode instead of the native compilation step (which unfortunately it looks like there's no easy way to modify pyre-check's build config to do so).2 projects | news.ycombinator.com | 23 Aug 2021
I must be doing something wrong.
Write better Python - with some help!
7 projects | dev.to | 3 Aug 2021
Some other good alternatives for type checking are Pyright (which is seen in VSCode via Microsofts PyLance plugin) and Pyre.
12 Months of Rust, 50k+ changed lines of code, 8 design iterations. The extent of writing an async ASGI web server in Rust for Python for a 10% performance increase.
3 projects | reddit.com/r/rust | 30 Jun 2021
Sorry if this is something that you’re already aware of but there already exists a Python-related project with the same name which may lead to confusion. https://pyre-check.org
Pyre: A performant type-checker for Python 3
1 project | reddit.com/r/patient_hackernews | 10 May 20211 project | reddit.com/r/hackernews | 10 May 20216 projects | news.ycombinator.com | 10 May 2021
Adoption of Mypy for Python type checking: 45% already use it, 40% don't plan to
4 projects | news.ycombinator.com | 21 Mar 2021
pylsp with VSCode?
2 projects | reddit.com/r/vscode | 29 Apr 2022
I'm using VSCodium (VSCode without Microsoft's telemetry) which doesn't work with pylance, Microsoft's Python language server. It seems like the two main alternative contenders are pyright and pylsp. I've been trying pyright, which has an extension, but it doesn't seem to support docstrings on all packages. I couldn't find any configuration options for setting an alternative language server in VSCode. Anyone have some tips on how to set up pylsp?
How do I configure a linter to check if method signatures are type hinted?
1 project | reddit.com/r/learnpython | 28 Apr 2022
While mypy is the (and also my) go-to solution, I recently found pyright but haven't used it yet.
Python’s “Type Hints” are a bit of a disappointment to me
Every point in this blog post strikes me as either (1) unaware of the tooling around python typing other than mypy, or (2) a criticism of static-typing-bolted-on-to-a-dynamically-typed-language, rather than Python's hints. Regarding (1), my advise to OP is to try out Pyright, Pydantic, and Typeguard. Pyright, especailly, is amazing and makes the process of working with type hints 2 or 3 times smoother IMO. And, I don't think points that fall under (2) are fair criticisms of type *hints*. They are called hints for a reason.
Otherwise, here's a point-by-point response, either recommending OP checks out tooling, or showing that the point being made is not specific to Python.
> type hints are not binding.
There are projects  that allow you to enforce type hints at runtime if you so choose.
It's worth mentioning that this is very analogous to how Typescript does it, in that type info is erased completely at runtime.
> Type checking is your job after all, ...[and that] requires maintenance.
There are LSPs like Pyright (pyright specifically is the absolute best, IMO) that report type errors as you code. Again, this is very very similar to typescript.
> There is an Any type and it renders everything useless
I have never seen a static-typing tool that was bolted on to a dynamically typed language, without an `Any` type, including typescript.
> Duck type compatibility of int and float
The author admits that they cannot state why this behavior is problematic, except for saying that it's "ambiguous".
> Most projects need third-party type hints
Again, this is a criticism of all cases where static types are bolted on dynamically typed languages, not Python's implementation specifically.
> Sadly, dataclasses ignore type hints as well
Pydantic is an amazing data parsing library that takes advantage of type hints, and it's interface is a superset of that of dataclasses. What's more, it underpins FastAPI, an amazing API-backend framework (with 44K Github stars).
> Type inference and lazy programmers
The argument of this section boils down to using `Any` as a generic argument not being an error by default. This is configurable to be an error both in Pyright, and mypy.
> Exceptions are not covered [like Java]
I can't find the interview/presentation, but Guido Van Rossum specifically calls out Java's implementation of "exception annotations" as a demonstration of why that is a bad idea, and that it would never happen in Python. I'm not saying Guido's opinion is the absolute truth, but just letting you know that this is an explicit decision, not an unwanted shortcoming.
MyPy isn’t the only checker of course, there’s also Microsoft’s Pyright, among others. Pyright is fast and natively integrated in Microsoft’s Pylance VSCode extension, so these days I use Pyright’s type checking in real time even when I can’t be bothered to set up MyPy (no difficult, just not important for, say, <1000 line scripts).
pyright is a command line program https://github.com/microsoft/pyright
in my experience it's a far better type checker than mypy, which tends to silently not check things without you ever realising
Language server protocol choice
1 project | reddit.com/r/neovim | 21 Mar 2022
There's nothing to trust, pyright is entirely open source and you can check it yourself: https://github.com/Microsoft/pyright
Help with type hints and higher order functions
2 projects | reddit.com/r/learnpython | 17 Mar 2022
Turns out it was a bug in pyright - the first example never type checked with mypy. :/
Disabling virtual text for only some LSP messages
2 projects | reddit.com/r/neovim | 3 Mar 2022
From: https://github.com/microsoft/pyright/blob/main/docs/configuration.md2 projects | reddit.com/r/neovim | 3 Mar 2022
This discussion probably gives more context than I ever could: https://github.com/microsoft/pyright/issues/1118
Pyright – Static type checker for Python
1 project | news.ycombinator.com | 20 Feb 2022
What are some alternatives?
mypy - Optional static typing for Python
jedi-language-server - A Python language server exclusively for Jedi. If Jedi supports it well, this language server should too.
pylance-release - Documentation and issues for Pylance
python-language-server - Microsoft Language Server for Python
coc-jedi - coc.nvim wrapper for https://github.com/pappasam/jedi-language-server
lsp-pyright - lsp-mode :heart: pyright
Poetry - Python dependency management and packaging made easy.
coc-pyright - Pyright extension for coc.nvim
pytype - A static type analyzer for Python code
pydantic-sqlalchemy - Tools to convert SQLAlchemy models to Pydantic models