Metadata-Version: 2.1
Name: runtime_generics
Version: 1.1.0
Summary: Reuse type arguments explicitly passed at runtime to a generic class before instantiating.
License: MIT
Author: bswck
Author-email: bswck.dev@gmail.com
Requires-Python: >=3.8,<4.0
Classifier: License :: OSI Approved :: MIT License
Classifier: Programming Language :: Python :: 3
Classifier: Programming Language :: Python :: 3.8
Classifier: Programming Language :: Python :: 3.9
Classifier: Programming Language :: Python :: 3.10
Classifier: Programming Language :: Python :: 3.11
Classifier: Programming Language :: Python :: 3.12
Description-Content-Type: text/markdown

# runtime_generics [![Package version](https://img.shields.io/pypi/v/runtime-generics?label=PyPI)](https://pypi.org/project/runtime-generics) [![Supported Python versions](https://img.shields.io/pypi/pyversions/runtime-generics.svg?logo=python&label=Python)](https://pypi.org/project/runtime-generics)
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[![Ruff](https://img.shields.io/endpoint?url=https://raw.githubusercontent.com/astral-sh/ruff/main/assets/badge/v2.json)](https://github.com/astral-sh/ruff)
[![Code style](https://img.shields.io/badge/code%20style-black-000000.svg?label=Code%20style)](https://github.com/psf/black)
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[![Pre-commit](https://img.shields.io/badge/pre--commit-enabled-brightgreen?logo=pre-commit&logoColor=white)](https://github.com/pre-commit/pre-commit)

Highly into type-safe Python code?

_runtime_generics_ is a niche Python library that allows you to reuse type arguments explicitly passed at runtime
to generic classes before instantiation.
The library does two things:
- makes it possible to retrieve the type argument passed to the generic class at runtime
  before the class was instantiated;
- given a parametrized generic class (generic alias),
  it makes every class method use generic alias `cls` instead of the origin class.

# Simple example
3.12+ ([PEP 695](https://peps.python.org/pep-0695) syntax):
```python
from runtime_generics import runtime_generic, select

@runtime_generic
class MyGeneric[T]:
    type_argument: type[T]

    def __init__(self) -> None:
        self.type_argument = select[T](self)

    @classmethod
    def whoami(cls):
        print(f"I am {cls}")

my_generic = MyGeneric[int]()
assert my_generic.type_argument is int
my_generic.whoami()  # I am MyGeneric[int]

```

3.8+:

```python
from __future__ import annotations

from typing import Generic, TypeVar
from runtime_generics import runtime_generic, select

T = TypeVar("T")

@runtime_generic
class MyGeneric(Generic[T]):
    type_argument: type[T]

    def __init__(self) -> None:
        self.type_argument = select[T](self)

    @classmethod
    def whoami(cls):
        print(f"I am {cls}")

my_generic = MyGeneric[int]()
assert my_generic.type_argument is int
my_generic.whoami()  # I am MyGeneric[int]
```

# Installation
If you want to…


## …use this tool in your project 💻
You might simply install it with pip:

    pip install runtime-generics

If you use [Poetry](https://python-poetry.org/), then run:

    poetry add runtime-generics

## …contribute to [runtime_generics](https://github.com/bswck/runtime_generics) 🚀

Happy to accept contributions!

> [!Note]
> If you use Windows, it is highly recommended to complete the installation in the way presented below through [WSL2](https://learn.microsoft.com/en-us/windows/wsl/install).

First, [install Poetry](https://python-poetry.org/docs/#installation).<br/>
Poetry is an amazing tool for managing dependencies & virtual environments, building packages and publishing them.

    pipx install poetry

<sub>If you encounter any problems, refer to [the official documentation](https://python-poetry.org/docs/#installation) for the most up-to-date installation instructions.</sub>

Be sure to have Python 3.8 installed—if you use [pyenv](https://github.com/pyenv/pyenv#readme), simply run:

    pyenv install 3.8

Then, run:

    git clone https://github.com/bswck/runtime_generics path/to/runtime_generics
    cd path/to/runtime_generics
    poetry env use $(cat .python-version)
    poetry install
    poetry shell
    pre-commit install --hook-type pre-commit --hook-type pre-push


# Legal info
© Copyright by Bartosz Sławecki ([@bswck](https://github.com/bswck)).<br />This software is licensed under the [MIT License](https://github.com/bswck/runtime_generics/blob/main/LICENSE).


