Bug: AttributeError: attribute '__default__' of 'typing.ParamSpec' objects is not writable

[Shanmukh-C]

Hello,

Getting above error when deploying my fastapi based service. Here is my poetry files for your refference. I am using lastest version.

[tool.poetry.dependencies]
python = "^3.13"
fastapi = ">=0.101.1,<0.102.0"
uvicorn = ">=0.23.2,<0.24.0"
websockets = "^14.1"
pydantic = ">=1.10.12,<1.11.0"
aiokafka = "^0.12.0"
faststream = "^0.5.34"
fast-depends = "^2.4.12"
typing-extensions = "4.12.2"

[tool.poetry.group.dev.dependencies]
setuptools = "^75.6.0"

[build-system]
requires = ["poetry-core", "setuptools", "wheel"]
build-backend = "setuptools.build_meta"

[JelleZijlstra]

I think your environment is in some weird state. The typing-extensions code that errors is the branch for before Python 3.13, but you are evidently running 3.13. I couldn't reproduce this on 3.13.0.