installation hanging

[Pythonaire]

Try to install on a clean system, but it hangs with" Building wheel for cryptography (pyproject.toml) ... /" and CPU = 100%
Following the instructions to update pip didn't help. Renew the system again, the install routine claims it need rust ..
python version is 3.9

[skoold2003]

Same problem, even after installing Rust..

[JKoss2]

I'm getting the same issue. I installed cryptography manually to install the twilio library and that worked fine (initially, the twilio install threw the same cryptography error, now it doesn't). In fact, when installing Hap-python[QRCode], just like 16 lines above "Collecting cryptography", which causes the error, it says "Requirement already satisfied: cryptography in /usr/lib/python3/dist-packages (from HAP-python[QRCode]) (3.3.2)".
I don't understand why it's trying to install it again if the requirement is already satisfied.
And I do not want to manually build using rust.

One weird thing I noticed, in the details of the error it says "n/a" for pip. My pip version is:
pip 22.3.1 from /usr/local/lib/python3.9/dist-packages/pip (python 3.9)

System Info from error:
Python: 3.9.2
platform: Linux-5.15.76-v7+-armv7l-with-glibc2.31
pip: n/a
setuptools: 65.6.3
setuptools_rust: 1.5.2
rustc: n/a

EDIT:
Disclaimer: I don't know 100% of what I'm talking about, so take it with a grain of salt.
I noticed that this issue is caused by "piwheels". The link below shows that the build for 38.0.3 failed. I think this means there is no precompiled "wheel"(?) we can use to install. I manually installed 38.0.1 with pip install cryptography==38.0.1 and HAP-python was able to install successfully. I'm assuming HAP-python must have a requirement for cryptography to be greater than 3.4.6 even though the requirements.txt doesn't specify a version.
https://www.piwheels.org/project/cryptography/

[Pythonaire]

Try to install on a clean system, but it hangs with" Building wheel for cryptography (pyproject.toml) ... /" and CPU = 100%
Following the instructions to update pip didn't help. Renew the system again, the install routine claims it need rust ..
python version is 3.9

reinstall older version works for me: pip install pip3 install --upgrade HAP-python[QRCode]==4.4