Logging uncaught exceptions in Python

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Here’s a complete small example that also includes a few other tricks:

import sys
import logging
logger = logging.getLogger(__name__)
handler = logging.StreamHandler(stream=sys.stdout)
logger.addHandler(handler)

def handle_exception(exc_type, exc_value, exc_traceback):
    if issubclass(exc_type, KeyboardInterrupt):
        sys.__excepthook__(exc_type, exc_value, exc_traceback)
        return

    logger.error("Uncaught exception", exc_info=(exc_type, exc_value, exc_traceback))

sys.excepthook = handle_exception

if __name__ == "__main__":
    raise RuntimeError("Test unhandled")

  • Ignore KeyboardInterrupt so a console python program can exit with Ctrl + C.

  • Rely entirely on python’s logging module for formatting the exception.

  • Use a custom logger with an example handler. This one changes the unhandled exception to go to stdout rather than stderr, but you could add all sorts of handlers in this same style to the logger object.

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