Understanding default flask logging

Question

Flask writes some logging lines witout me setting anything special or adding any extra lines, eg:

127.0.0.1 - - [08/Jul/2020 10:24:46] "GET /swaggerui/favicon-32x32.png HTTP/1.1" 200 -
127.0.0.1 - - [08/Jul/2020 10:24:46] "GET /swagger.json HTTP/1.1" 200 -
127.0.0.1 - - [08/Jul/2020 10:24:52] "GET /random_resource/1/1 HTTP/1.1" 404 -

I have been learning the logging module and I want to implement a better logging without having to actually add the log calls everytime:

log.warn('Warning message')

I would like to modify the existing log that is being used and modify it at my will without having to add the calls to the logging in everyline of the module.

EDIT

Using app.logger doesnt solve the issue as it produces a completely different format:

app.logger.info(f"user_id:{request.view_args['user_id']}")

[2020-07-08 11:56:33,894] INFO in __init__: user_id:1

Jürgen Gmach · Accepted Answer · 2020-07-08 08:49:34Z

1

Flask's logging instance is available via app.logger

Also see the official documentation:

https://flask.palletsprojects.com/en/1.1.x/logging/?highlight=logging

answered Jul 8, 2020 at 8:49

Jürgen Gmach

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2 Comments

Alejandro A Over a year ago

Sorry but no, the application itself still produces logs like: 127.0.0.1 - - [08/Jul/2020 11:56:33] "GET /random_resource/1/1 HTTP/1.1" 404 -. If I use your suggestion it looks like a different format: [2020-07-08 11:56:33,894] INFO in init: user_id:1

Jürgen Gmach Over a year ago

I am sorry. If the official documentation is wrong, please file an issue at Flask's Bug tracker at GitHub.

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