Execute "AT" command in Python

[Larz60+]

I can't give you a complete answer as my needs are few, and I usually do any 'AT' commands directly using Putty.

I will instead direct you to paramiko (which is an implementation of the SSHv2 protocol) URL's:
pipy: https://pypi.org/project/paramiko/
main site: https://www.paramiko.org/
GitHub: https://github.com/paramiko/paramiko

Check the 'demos' https://github.com/paramiko/paramiko/tree/main/demos
to see if you can find an example of what you're looking for.

There may be better options.