Logo Questions Linux Laravel Mysql Ubuntu Git Menu
 

Python logging - check location of log files?

What is the methodology for knowing where Python log statements are stored?

i.e. if i do:

import logging log = logging.getLogger(__name__) log.info('Test') 

Where could I find the logfile? Also, when I call:

logging.getLogger(__name__) 

Is that somehow related to how the logger will behave/save?

like image 862
zallarak Avatar asked Jan 18 '13 19:01

zallarak


People also ask

How do I check Python log files?

basicConfig(filename=log_file_name) where log_file_name is the name of the file you want messages written to (note that you have to do this before anything else in logging is called at all), then all messages logged to all loggers (unless some further reconfiguration happens later) will be written there.

Where does Python logger output to?

logging - Making Python loggers output all messages to stdout in addition to log file - Stack Overflow.

What is log Dir in Python?

A Python library for managing logging directories. Source. PyPI.


2 Answers

The logging module uses handlers attached to loggers to decide how, where, or even if messages ultimately get stored or displayed. You can configure logging by default to write to a file as well. You should really read the docs, but if you call logging.basicConfig(filename=log_file_name) where log_file_name is the name of the file you want messages written to (note that you have to do this before anything else in logging is called at all), then all messages logged to all loggers (unless some further reconfiguration happens later) will be written there. Be aware of what level the logger is set to though; if memory serves, info is below the default log level, so you'd have to include level=logging.INFO in the arguments to basicConfig as well for your message to end up in the file.

As to the other part of your question, logging.getLogger(some_string) returns a Logger object, inserted in to the correct position in the hierarchy from the root logger, with the name being the value of some_string. Called with no arguments, it returns the root logger. __name__ returns the name of the current module, so logging.getLogger(__name__) returns a Logger object with the name set to the name of the current module. This is a common pattern used with logging, as it causes the logger structure to mirror your code's module structure, which often makes logging messages much more useful when debugging.

like image 170
Silas Ray Avatar answered Oct 07 '22 14:10

Silas Ray


To get the log location of a simple file logger, try

logging.getLoggerClass().root.handlers[0].baseFilename 
like image 30
Taran Avatar answered Oct 07 '22 14:10

Taran