CODEWITHSUNDEEP
pythonpython-3.xerror-logging
DANIEL1475
DANIEL1475

Reputation: 25

how to log all errors in python

I want to save ALL ERRORS into a file which means the errors outside an exception, also get in the log file.

for example import some module and in the begining of a script, set it to save the errors; something like this:

import blob
blob.save_errors(filename)

try:
  lst = ['a']
  print(lst[2]) # save this Error
except:
  pass

print(2/0) # also save this error

Upvotes: 1

Views: 1835

Answers (1)

Ihor Konovalenko
Ihor Konovalenko

Reputation: 1407

There is no easy automatic way to process all the exception, it contradict with exception handling idea.

One of solutions: we can log all uncatched exceptions like this way:

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)
    else:
        logger.critical("Exception occured:", exc_info=(exc_type, exc_value, exc_traceback))

sys.excepthook = handle_exception

# Just to test
if __name__ == "__main__":
    raise Exception("Something happend!")

And to log all handled exception we need to all logging in except block:

try:
    ...
except:
    logger.error("Exception occured:", exc_info=(exc_type, exc_value, exc_traceback))
    ...

Other way to deal with exception is to handle them in top-level function. All non-handled exceptions from downstream functions will be processed in top-level except block:

def my_main_func():
    try:
        run_my_application_logic()
    except:
        # Logging
        logger.error("Exception occured:", exc_info=(exc_type, exc_value, exc_traceback))

def run_my_application_logic():
    first_step_of_app()
    second_step_of_app()
    third_step_of_app()


if __name__ == "__main__":
    my_main_func()

Upvotes: 2

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