# pydantic-basedtyping support for basedtyping features with pydantic: ```py from __future__ import annotations from pydantic import BaseModel class A(BaseModel): a: 1 | 2 A(a=1) # A(a=1) A(a=2) # A(a=2) A(a=3) # ValidationError ``` > [!NOTE] > the types need to be written as a string, or `__future__.annotations` needs to be enabled # installation 1. add `pydantic-basedtyping` as a dependency 2. install the plugin with: ```console python -m pydantic_basedtyping install ``` if you are using [pyprojectx](https://pyprojectx.github.io/), this can be configured: ```toml [tool.pyprojectx] install = ["uv sync", "uv run python -m pydantic_basedtyping install"] ```