wheel: AssertionError: would build wheel with unsupported tag ('cp38', 'cp38', 'linux_aarch64')

Experiencing this error when pip install numpy and cryptography in Docker container on Raspberry. While images built in May and June of 2020 worked well. Tried and it didn’t work:

• downgrading versions of wheel and packages,

• vice versa, upgrading pip, wheel and packages to the very latest versions

• pip install cryptography --no-binary cryptography

Maybe it is an arm64 issue. For instance, cryptography doesn’t list this platform as supported https://cryptography.io/en/latest/installation/#build-on-linux

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Workaround

pip install -e git+https://github.com/pyca/cryptography.git#egg=cryptography

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Details

      File "/tmp/pip-build-env-n8ueeulb/overlay/lib/python3.8/site-packages/wheel/bdist_wheel.py", line 278, in get_tag
        assert tag in supported_tags, "would build wheel with unsupported tag {}".format(tag)
    AssertionError: would build wheel with unsupported tag ('cp38', 'cp38', 'linux_aarch64')
  ...
  ERROR: Could not build wheels for numpy which use PEP 517 and cannot be installed directly

OS : Raspbian GNU/Linux 10 (buster) Docker: 19.03.12 Base: python:3.8-buster