M1 mac mini: Python reports `mach-o, but wrong architecture`

Question

We've rented a M1 Mac Mini at a Cloud provider and installed python3 via homebrew.

However, when installing packages, we see many errors reporting wrong architecture mismatches.

pip3 install <something>

/private/var/folders/s9/94x83w5x5gv1tkw6pgcvy55r0000gn/T/pip-install-6zb2vf39/rchitect_2226cf31d84b4fbeb14084a47e566d22/.eggs/cffi-1.14.5-py3.9-macosx-11.4-arm64.egg/_cffi_backend.cpython-39-darwin.so: mach-o, but wrong architecture

Other CLI libraries work just fine with their (native) brew installations. Rosetta is not even installed.

I am not heavily into Python and searching the web did not help, hence I suspect something non-standard might be going on here.

brew info python3
python@3.9: stable 3.9.5 (bottled)
Interpreted, interactive, object-oriented programming language
https://www.python.org/
/opt/homebrew/Cellar/python@3.9/3.9.5 (3,108 files, 55.5MB) *
  Poured from bottle on 2021-05-27 at 20:07:29
From: https://github.com/Homebrew/homebrew-core/blob/HEAD/Formula/python@3.9.rb
License: Python-2.0

which python3
/opt/homebrew/bin/python3

Does anyone have a clue what might be going on?

Edit: Here are the architectures of the files

file /opt/homebrew/bin/python3
/opt/homebrew/bin/python3: Mach-O 64-bit executable arm64

file /private/var/folders/s9/94x83w5x5gv1tkw6pgcvy55r0000gn/T/pip-install-nq_w_w15/rchitect_e1cd9cd747dc44e2a7f69885db619a02/.eggs/cffi-1.14.5-py3.9-macosx-11-arm64.egg/_cffi_backend.cpython-39-darwin.so: Mach-O 64-bit bundle x86_64

The downloaded egg of cffi is the wrong architecture. Why is this happening and who might be the bad player here?

Answer 1

Pypi does not provide an ARM package for this software for macOS. Only X86_64.

How do I know?

I actually went and looked.

https://pypi.org/project/cffi/#files