Thanks for sharing your experience here. Stackdriver Debugger does support the python-compat runtime albeit currently in Beta. I was able to successfully use it with a python-compat module I deployed today. To get a better idea what might be going on, I would need some additional information:
- When did you encounter this error message?
- Have you tried to recommit/push and redeploy in the past day or two?
- Do you get the same error message deploying a "Hello, world" sample application with the python-compat runtime?
With the above information, I should be in a better position to determine if this warrants further troubleshooting or if this aligns with some recent changes to backend and frontend of Stackdriver Debugger.