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Discussion on: Write Unbreakable Python

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Thanks a lot for this article!

Consider using returns library. It has several most useful monads like Maybe, Result, IO, IOResult, Reader, and their combinations.

The main feature of this library is that it is fully typed with mypy. So, mypy will check that you are writing correct code before even running it.

We also have beginner-friendly docs, so it would easy to teach your team to use it.

dry-python / returns

Make your functions return something meaningful, typed, and safe!

Features

Provides a bunch of primitives to write declarative business logic
Enforces better architecture
Fully typed with annotations and checked with mypy, PEP561 compatible
Has a bunch of helpers for better composition
Pythonic and pleasant to write and to read 🐍
Support functions and coroutines, framework agnostic
Easy to start: has lots of docs, tests, and tutorials

Installation

pip install returns

You might also want to configure mypy correctly and install our plugin to fix this existing issue:

# In setup.cfg or mypy.ini:
[mypy]
plugins =
  returns.contrib.mypy.decorator_plugin

We also recommend to use the same mypy settings we use.

Make sure you know how to get started, check out our docs!

Maybe container that allows you to write None-free code
RequiresContext container that allows you to use typed functional dependency injection
Result container that let's you…

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Jesse Warden • Mar 18 '20

Dude, that library is awesome. The annotations + automatic lifting of types is great!
I'll never be a fan of Python's TypeScript/Java inline typing style, ML/Haskell made me a fan of their way, but overall, I'm loving what I'm seeing in returns, thanks a lot for the share.