How to use Python's built in logger for INFO messages

Question

I am having difficulty with the built-in logger module. WARNING messages show up but not INFO messages. Like so:

Python 2.7.10 (default, May 23 2015, 09:40:32) [MSC v.1500 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import logging
>>> logging.info('Info')  # This line was inserted.
>>> logging.basicConfig(level=logging.DEBUG)
>>> logging.warning('Warning')
WARNING:root:Warning
>>> logging.info('Info')
>>>

Interestingly, after walking away from my desk for an hour or so and then starting a new session I got the following:

Python 2.7.10 (default, May 23 2015, 09:40:32) [MSC v.1500 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import logging
>>> logging.basicConfig(level=logging.DEBUG)
>>> logging.warning('Warning')
WARNING:root:Warning
>>> logging.info('Info')
INFO:root:Info
>>>

It worked! The question is why did the first version not work.

Note: The question has been edited.

Possible duplicate of logging.info doesn't show up on console but warn and error do — Thtu
– Thtu, Commented May 4, 2016 at 1:22
Strange. That would be the expected behaviour if you hadn't set the level=logging.DEBUG parameter. It works for me as expected as you have it though. — Jamie Bull
– Jamie Bull, Commented May 4, 2016 at 1:22
The code in Thomas's link worked for me. Check out my answer below with the line of code that worked. — MattCorr
– MattCorr, Commented May 4, 2016 at 1:34
FYI: There is a bug in PyScripter (which is otherwise a great debugging environment) and it does not properly display logging messages when using the recommended remote Python interpreter. — ChaimG
– ChaimG, Commented May 4, 2016 at 3:35

Guoliang · Accepted Answer · 2016-05-04 01:24:23Z

2

I'm confused with your output, it may worth to try again using just the logging code: e.g.

Python 2.7.10 (default, May 23 2015, 09:40:32)
Type "help", "copyright", "credits" or "license" for more information.
>>> import logging
>>> logging.basicConfig(level=logging.DEBUG)
>>> logging.warning('warning')
WARNING:root:warning
>>> logging.debug('debug')
DEBUG:root:debug
>>> logging.info('info')
INFO:root:info

you may refer to https://docs.python.org/2/library/logging.html to get more details.

answered May 4, 2016 at 1:24

Guoliang

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1 Comment

ChaimG Over a year ago

Thanks. I tried again using your code and it worked. That led me to trace down the problem. See the revised question.

Community · Accepted Answer · 2017-05-23 12:23:52Z

-1

The default level that logging is set to is warning. Any messages below that level(such as info messages) do not display. To change that, use this code:

logging.getLogger().setLevel(logging.INFO)

Reference:

logging.info doesn't show up on console but warn and error do

edited May 23, 2017 at 12:23

CommunityBot

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answered May 4, 2016 at 1:23

MattCorr

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