Re: How to detect an undefined method?

[Peter Otten]

On 27/03/2022 11:24, Manfred Lotz wrote:

Let's say I have a Python app and have used an undefined method somewhere. Let
us further assume I have not detected it thru my tests.

Is there a way to detect it before deploying the app? pylint doesn't notice it.


Minimal example:

#!/usr/bin/env python3

import logging
from logging import Logger
from random import randrange

def main():
     """
     Below logger.err gives

     'Logger' object has no attribute 'err'
     """

     logger = logging.getLogger('sample')
     logger.setLevel(logging.DEBUG)
     handler = logging.StreamHandler()
     logger.addHandler(handler)

     num = randrange(0,1000)
     if num == 0:
         logger.err("got zero")
     else:
         logger.info(f'got a positive integer: {num}')

if __name__ == "__main__":
     main()

mypy --strict will find that one. Be warned though that this is a
slippery slope: you may end up fixing quite a few non-errors...

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