https://github.com/Kludex/no-optional

Replace `Optional[T]` by `Union[T, None]` 👀
https://github.com/Kludex/no-optional

Last synced: about 2 months ago
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Replace `Optional[T]` by `Union[T, None]` 👀

• Host: GitHub
• URL: https://github.com/Kludex/no-optional
• Owner: Kludex
• License: mit
• Created: 2022-06-14T04:53:33.000Z (over 2 years ago)
• Default Branch: main
• Last Pushed: 2022-06-25T06:38:39.000Z (over 2 years ago)
• Last Synced: 2024-06-21T08:45:12.905Z (3 months ago)
• Language: Python
• Homepage:
• Size: 24.4 KB
• Stars: 55
• Watchers: 3
• Forks: 0
• Open Issues: 3
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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• awesome-python-code-formatters - no-optional

README

        


    no-optional





    

        

    

    

    



This [codemod](https://libcst.readthedocs.io/en/stable/codemods_tutorial.html) replaces `typing.Optional[T]` by `typing.Union[T, None]` in the codebase.

## Why?

This tool was inspired by a tweet from [Sebastián Ramírez](https://twitter.com/tiangolo) (as you see below), and a conversation between us.



As the tweet says, we have two reasons for doing this:

1. It's more explicit to write `Union[str, None]` than `Optional[str]`. Mainly because `Optional[str]` doesn't mean that the attribute is optional.

It only means that it accepts `None` as a possible value.

2. On Python 3.10+ you can type annotate as `str | None` instead of the above two. Which is more similar to `Union[str, None]` than `Optional[str]`.

## Alternative

[`pyupgrade`](https://github.com/asottile/pyupgrade) is great but `no-optional` is better when you need runtime support like for `FastAPI` and `pydantic`.

The reason being that `no-optional` just does the replacement. On the other hand, `pyupgrade` requires [`from __future__ import annotations`](https://peps.python.org/pep-0563/) for versions below Python 3.10.

## Installation

```bash

pip install no-optional

```

## Usage

Run the following on the repository you want to format:

```bash

python -m no_optional 

```

You can also use the pre-commit. Add the following to your `.pre-commit-config.yaml` file:

```yaml

  - repo: https://github.com/Kludex/no-optional

    rev: 0.4.0

    hooks:

      - id: no_optional

```

## License

This project is licensed under the terms of the MIT license.