Example for getting an exception callback even when the exception is handled in inner code:

monitoring_example.py

# This makes use of sys.monitoring, described in PEP 669 and implemented in Python 3.12

import time
import sys

def aha(*args):
    print(args)

def worker():
    while True:
        time.sleep(1)
        try:
            # this error sould not ordinarily be visible in any
            # outer scope:
            1/0
        except ZeroDivisionError:
            pass

TOOL_ID = 3

def start():
    worker()


def main():
    watched = sys.monitoring.events.RAISE
    try:
        x = sys.monitoring.use_tool_id(TOOL_ID, "test")
        sys.monitoring.register_callback(TOOL_ID, watched, aha)
        sys.monitoring.set_events(TOOL_ID, watched)
        start()
    finally:
        sys.monitoring.free_tool_id(TOOL_ID)

if __name__ == "__main__":
    main()