install logging python code example

Example 1: python logging to file

import logging
import sys

logger = logging.getLogger()
logger.setLevel(logging.INFO)
formatter = logging.Formatter('%(asctime)s | %(levelname)s | %(message)s', 
                              '%m-%d-%Y %H:%M:%S')

stdout_handler = logging.StreamHandler(sys.stdout)
stdout_handler.setLevel(logging.DEBUG)
stdout_handler.setFormatter(formatter)

file_handler = logging.FileHandler('logs.log')
file_handler.setLevel(logging.DEBUG)
file_handler.setFormatter(formatter)

logger.addHandler(file_handler)
logger.addHandler(stdout_handler)

Example 2: python logging to file

import logging

"""
DEBUG
INFO
WARNING
ERROR
CRITICAL
"""
# asctime: time of the log was printed out
# levelname: name of the log
# datefmt: format the time of the log
# give DEBUG log
logging.basicConfig(format='%(asctime)s %(levelname)-8s [%(filename)s:%(lineno)d] %(message)s',
    datefmt='%d-%m-%Y:%H:%M:%S',
    level=logging.DEBUG,
    filename='logs.txt')

logger = logging.getLogger('my_app')

logger.debug("This is a debug log")
logger.info("This is an info log")
logger.critical("This is critical")
logger.error("An error occurred")

Example 3: logging.logger

import logging

logging.basicConfig(level=logging.WARNING)
logger = logging.getLogger(__name__)
logger.setLevel(logging.DEBUG)
  
logger.debug("some debugging...")
logger.error("some error...")

Example 4: what do you use for logging

I use Log4J for logging. 
I always log important steps in the test
execution. That helps me to debug
when there is a failure.
Log4J is not a replacement for HTML reports.
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j- core</artifactId>
<version>2.11.0</version>
</dependency>