The single biggest issue

[tdjastrzebski]

As far as I am concerned, the single biggest issue is mbed-cli requires older Python 3.6 and does not work with the latest LTS version 3.8. For a developer like myself using Python and many other tools depending on it, probably it causes a lot disadvantage.
Sure I know, Python likes to change things around and, surprisingly, backwards compatibility is not a top priority for its development community but still.
Personally, I would consider rewriting mbed-cli in TypeScript to avoid Python breaking changes in the future.

[ciarmcom]

Thank you for raising this detailed GitHub issue. I am now notifying our internal issue triagers.
Internal Jira reference: https://jira.arm.com/browse/IOTBTOOL-945

[LDong-Arm]

Hi @tdjastrzebski, I have been using python 3.8 for a while and mbed-cli works for me. Have you tried making sure pip is from the same python installation (i.e. pip --version prints which python version it has), reinstalling mbed-cli (pip install -U mbed-cli), then installing mbed-os requirements (pip install -r <path/to/mbed-os>/requirements.txt)?