I have a script running 24/7 on my Pi. Something went wrong in a Try: except: block in which I failed to include a traceback object (https://docs.python.org/2/library/traceback.html), so I don't really know what went wrong in my function.
The script is still running (in screen). Is there a way I can print a traceback now?
No, you can't. Update your code to also log the traceback and if it happens again you'll have the traceback.