Rust-like Option and Result types in Python, slotted and fully typed.

An Option type represents an optional value, every Option is either Some and contains Some value, or NONE

A Result type represents a value that might be an error. Every Result is either Ok and contains a success value, or Err and contains an error value.

Using an Option type forces you to deal with None values in your code and increase type safety.

Using a Result type simplifies error handling and reduces try except blocks.

from option import Result, Option, Ok, Err
from requests import get


def call_api(url, params) -> Result[dict, int]:
    result = get(url, params)
    code = result.status_code
    if code == 200:
        return Ok(result.json())
    return Err(code)


def calculate(url, params) -> Option[int]:
    return call_api(url, params).ok().map(len)


dict_len = calculate('https://example.com', {})

Option can be installed from PyPi:

pip install option

The documentation lives at https://mat1g3r.github.io/option/

MIT