Python Logging in a file

  • January 24, 2023
  • python
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In Python, you can use the built-in logging module to print logging in a file. Here are the basic steps to do this:

  1. Import the logging module:
import logging
  1. Create a logging.FileHandler object, and specify the file name and mode in which the file should be opened:
file_handler = logging.FileHandler('example.log', mode='w')
  1. Set the logging level and format for the file handler:
file_handler.setFormatter(logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s'))
  1. Add the file handler to the root logger:
  1. Use the logging methods to print the logs in the file:
logging.debug('debug message')'info message')
logging.warning('warning message')
logging.error('error message')
logging.critical('critical message')

This code will create a file named example.log in the current working directory and write the logs in it. Each log message will include the date and time, the logger name, the level of the message, and the message itself.

It’s important to note that when you are done with the logging, you should close the file handler by calling file_handler.close()

You can also use other options to customize the logging, like rotating the file when it reaches a certain size or creating a new file when the log reaches a certain date.

#importing the module 
import logging 

#now we will Create and configure logger 
					format='%(asctime)s %(message)s', 

#Let us Create an object 

#Now we are going to Set the threshold of logger to DEBUG 

#some messages to test
logger.debug("debug message")"information") 

The above code will write some messages to a file named File1.log.

Note: also read about Logging basicConfig()function

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