Why is Python's Logger Returning Errors When There Isn't An Error?

Question

I think I am not understanding how Python's logging library works. I have a simple function:

 def all_caps(_string):

    logging.debug("debug") 
    logging.info("info") 
    logging.warning("warning") 
    logging.error("error")
    logging.critical("critical")

    return _string.upper()

From what I understand from tutorials, if I run this function with an input that produces no errors (e.g. all_caps("hello")), I should see the output:

DEBUG:root:debug
INFO:root:info

However, I see the exact opposite:

WARNING:root:warning
ERROR:root:error
CRITICAL:root:critical
HELLO

Am I crazy? Am I using logging fundamentally wrong?

Some good info: timber.io/blog/the-pythonic-guide-to-logging/#levels — AGN Gazer
– AGN Gazer, Commented Sep 19, 2018 at 1:47

score 2 · Accepted Answer · 2018-09-19 01:37:34Z

2

Each logging function you call from the module will have the root logger send the requested message at the corresponding level, so with the default configuration, you should see messages for at least everything WARN and higher.

edited Sep 19, 2018 at 1:37

answered Sep 19, 2018 at 1:22

user554538

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6 Comments

AGN Gazer Over a year ago

"by default" should be emphasized or emphasized

user554538 Over a year ago

I've reworded it hopefully to make it clearer. I could emphasize it too if it's not enough. Thanks!

AGN Gazer Over a year ago

The answer was clear enough already. However, I think it is important to highlight the that "WARN and higher" is only by default. However, your answer clarifies the confusion that @Anton I believe had: logging works from a set level up and not down.

Anton Over a year ago

Oh! So each call I make sends the requested message, and then these messages are filtered by the level parameter?

user554538 Over a year ago

I agree about defaults. Thanks again!

|

user9074332 · Accepted Answer · 2018-09-19 01:26:09Z

0

Your default logging level appears to be set to WARNING. Reset it using logging.basicConfig to get the desired results.

>>> import logging
>>> logging.basicConfig(level=logging.DEBUG)
>>> def all_caps(_string):
...     logging.debug("debug")
...     logging.info("info")
...     logging.warning("warning")
...     logging.error("error")
...     logging.critical("critical")
...
...     return _string.upper()
...
>>> all_caps("hello")
DEBUG:root:debug
INFO:root:info
WARNING:root:warning
ERROR:root:error
CRITICAL:root:critical
'HELLO'

answered Sep 19, 2018 at 1:26

user9074332

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