https://github.com/alexmojaki/eval_type_backport

Like `typing._eval_type`, but lets older Python versions use newer typing features.
https://github.com/alexmojaki/eval_type_backport

Last synced: 3 months ago
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Like `typing._eval_type`, but lets older Python versions use newer typing features.

• Host: GitHub
• URL: https://github.com/alexmojaki/eval_type_backport
• Owner: alexmojaki
• License: mit
• Created: 2023-11-10T14:35:44.000Z (over 1 year ago)
• Default Branch: main
• Last Pushed: 2024-12-21T20:09:39.000Z (7 months ago)
• Last Synced: 2025-03-31T18:21:58.160Z (3 months ago)
• Language: Python
• Size: 49.8 KB
• Stars: 13
• Watchers: 4
• Forks: 4
• Open Issues: 6
• Metadata Files:
  • Readme: README.md
  • License: LICENSE.txt

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README

        
# eval_type_backport

[![Build Status](https://github.com/alexmojaki/eval_type_backport/workflows/Tests/badge.svg)](https://github.com/alexmojaki/eval_type_backport/actions) [![Coverage Status](https://coveralls.io/repos/github/alexmojaki/eval_type_backport/badge.svg)](https://coveralls.io/github/alexmojaki/eval_type_backport) [![Supports Python versions 3.8+, including PyPy](https://img.shields.io/pypi/pyversions/eval_type_backport.svg)](https://pypi.python.org/pypi/eval_type_backport) [![Anaconda's conda-forge channel](https://anaconda.org/conda-forge/eval-type-backport/badges/version.svg)](https://anaconda.org/conda-forge/eval-type-backport)

This is a tiny package providing a replacement for `typing._eval_type` to support newer typing features in older Python versions.

Yes, that's very specific, and yes, `typing._eval_type` is a protected function that you shouldn't normally be using. Really this package is specifically made for https://github.com/pydantic/pydantic/issues/7873.

Specifically, this transforms `X | Y` into `typing.Union[X, Y]`

and `list[X]` into `typing.List[X]` etc. (for all the types made generic in PEP 585)

if the original syntax is not supported in the current Python version.

## Install

From PyPI:

```shell

pip install eval-type-backport

```

or with Conda:

```shell

conda install -c conda-forge eval-type-backport

```