Monads for python made simple and safe.
Project description
dry-monads
Monads for python
made simple and safe.
Features
- Provides primitives to write declarative business logic
- Fully typed with annotations and checked with
mypy
, allowing you to write type-safe code as well - No operator overloading or other unpythonic stuff that makes your eyes bleed
Installation
pip install dry-monads
What's inside?
We have several the most iconic monads inside:
- Result, Failure, and Success (also known as
Either
,Left
, andRight
) - Maybe, Some, and Nothing
We also care about code readability and developer experience, so we have included some useful features to make your life easier:
Example
from dry_monads.do_notation import do_notation from dry_monads.either import Result, Success, Failure class CreateAccountAndUser(object): """Creates new Account-User pair.""" @do_notation def __call__(self, username: str, email: str) -> Result['User', str]: """Can return a Success(user) or Failure(str_reason).""" user_schema = self._validate_user(username, email).unwrap() account = self._create_account(user_schema).unwrap() return self._create_user(account) # Protected methods # ...
We are covering what's going on in this example in the docs.
Inspirations
This module is heavily based on:
Project details
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