ZeroDivisionError: division by zero at divide (test.py:2) -> a=10, b=0 during call from <module> (test.py:4) For missing attributes, it suggests similar names from the local scope. For async / await mismatches, it shows the coroutine’s state. This is not just debugging — it is . The interpreter remembers the path it took and shows you footprints in the snow.
Consider:
Deep take: Python is admitting that no one understands large systems perfectly. So it becomes a co-investigator, not just a judge. Type hints in 3.13 move beyond gradual typing toward dependent-typing lite. PEP 742 introduces TypeIs for user-defined type guards, expanding on TypeGuard from 3.10. python 3.13 release news december 2025