Python Loguru Module
Loguru is a library which aims to make logging in Python enjoyable. It provides a pre-configured logger that just works, without the boilerplate of the standard logging module.
Installation
pip install loguruBasic Usage
You don't need to initialize a logger; just import the global logger object.
from loguru import logger
logger.debug("That's it, beautiful and simple logging!")
logger.info("If you're using Python {}, prefer {feature} of course!", 3.6, feature="f-strings")Sinks (Output Destinations)
Loguru uses "sinks" to manage where logs go. By default, it logs to stderr.
Logging to a File
from loguru import logger
logger.add("file_{time}.log")Rotation and Retention
You can easily configure log rotation and retention (cleanup).
# Rotate file when it reaches 500 MB
logger.add("file_1.log", rotation="500 MB")
# Rotate every day at 12:00
logger.add("file_2.log", rotation="12:00")
# Cleanup logs older than 10 days
logger.add("file_3.log", retention="10 days")
# Compress logs
logger.add("file_4.log", compression="zip")Exception Handling
Loguru provides a decorator to automatically catch exceptions and log the traceback.
from loguru import logger
@logger.catch
def my_function(x, y):
return x / y
my_function(1, 0)
# This will log the ZeroDivisionError automaticallySerialization
Loguru can log messages as JSON, which is useful for parsing.
logger.add("file.json", serialize=True)