You can look in the Arm Software Ecosystem Dashboard to see if the Python package is supported. It does not list all Python packages, but contains context for bigger ones such as PyTorch, Numpy, PyInstaller, etc.

The dashboard contains a list of what packages in general work on Arm Linux servers (aarch64), beyond Python packages, if you find that useful.

The contents are community-driven, so if you don't see a package listed that does support Arm, there is an option to add it via a GitHub PR in the main repository as well.