PYTHON

python logger format time

logging.basicConfig(
    filename='HISTORYlistener.log',
    level=logging.DEBUG,
    format='%(asctime)s.%(msecs)03d %(levelname)s %(module)s - %(funcName)s: %(message)s',
    datefmt='%Y-%m-%d %H:%M:%S',
)

logging python

import logging

logging.basicConfig(level=logging.DEBUG)
# logging.basicConfig(filename='app.log', filemode='w', format='%(name)s - %(levelname)s - %(message)s')

logging.debug('This is a debug message')
logging.info('This is an info message')
logging.warning('This is a warning message')
logging.error('This is an error message')
logging.critical('This is a critical message')

logging python

#!/usr/bin/env python

import logging

logging.basicConfig(filename='test.log', format='%(filename)s: %(message)s',
                    level=logging.DEBUG)

logging.debug('This is a debug message')
logging.info('This is an info message')
logging.warning('This is a warning message')
logging.error('This is an error message')
logging.critical('This is a critical message')

python logging format

# Logger setup in python
def get_logger(self) -> logging.RootLogger:
    """instance of logger module, will be used for logging operations"""
    
    # logger config
    logger = logging.getLogger(__name__)
    logger.setLevel(logging.DEBUG)

    # log format
    lg_format = "%(levelname)s|%(filename)s:%(lineno)d|%(asctime)s|%(message)s"
    log_format = logging.Formatter(lg_format)

    # file handler
    file_handler = logging.FileHandler("log/monitor_model.log")
    file_handler.setFormatter(log_format)

    logger.handlers.clear()
    logger.addHandler(file_handler)
    return logger

create log in python

logging.basicConfig(filename="logfilename.log", level=logging.INFO)
# Log Creation

logging.info('your text goes here')
logging.error('your text goes here')
logging.debug('your text goes here')

logger levels python

# Note: Only levels on or above the current chosen level are outputted

Logging Levels  -> Numeric Value

CRITICAL -> 50
ERROR -> 40
WARNING -> 30
INFO -> 20
DEBUG -> 10
NOTSET -> 0

python logging

# Example usage:
# For now, this is how I like to set up logging in Python:

import logging

# instantiate the root (parent) logger object (this is what gets called
# to create log messages)
root_logger = logging.getLogger()
# remove the default StreamHandler which isn't formatted well
root_logger.handlers = []
# set the lowest-severity log message to be included by the root_logger (this
# doesn't need to be set for each of the handlers that are added to the
# root_logger later because handlers inherit the logging level of their parent
# if their level is left unspecified. The root logger uses WARNING by default
root_logger.setLevel(logging.INFO)

# create the file_handler, which controls log messages which will be written
# to a log file (the default write mode is append)
file_handler = logging.FileHandler('/path/to/logfile.log')
# create the console_handler (which enables log messages to be sent to stdout)
console_handler = logging.StreamHandler()

# create the formatter, which controls the format of the log messages
# I like this format which includes the following information:
# 2022-04-01 14:03:03,446 - script_name.py - function_name - Line: 461 - INFO - Log message.
formatter = logging.Formatter('%(asctime)s - %(filename)s - %(funcName)s - Line: %(lineno)d - %(levelname)s - %(message)s')
# add the formatter to the handlers so they get formatted as desired
file_handler.setFormatter(formatter)
console_handler.setFormatter(formatter)

# set the severity level of the console_hander to ERROR so that only messages
# of severity ERROR or higher are printed to the console
console_handler.setLevel(logging.ERROR)

# add the handlers to the root_logger
root_logger.addHandler(file_handler)
root_logger.addHandler(console_handler)


# given the above setup
# running this line will append the info message to the /path/to/logfile.log
# but won't print to the console
root_logger.INFO("A casual message.")
# running this line will append the error message to the /path/to/logfile.log
# and will print it to the console
root_logger.ERROR("A serious issue!")

logging python

# simple logging example
import logging

level = logging.DEBUG
logging_format = "[%(levelname)s] %(asctime)s - %(message)s"
logging.basicConfig(level = level, format=logging_format)

def print_vs_logging():
    logging.debug("What is the value of this variable")
    logging.info("Just FYI")
    logging.error("We found the error")

print_vs_logging()

Python Logging

# importing module
import logging
 
# Create and configure logger
logging.basicConfig(filename="newfile.log",
                    format='%(asctime)s %(message)s',
                    filemode='w')
 
# Creating an object
logger = logging.getLogger()
 
# Setting the threshold of logger to DEBUG
logger.setLevel(logging.DEBUG)
 
# Test messages
logger.debug("Harmless debug Message")
logger.info("Just an information")
logger.warning("Its a Warning")
logger.error("Did you try to divide by zero")
logger.critical("Internet is down")

logger format

formatter = logging.Formatter('[%(asctime)s] p%(process)s {%(pathname)s:%(lineno)d} %(levelname)s - %(message)s','%m-%d %H:%M:%S')

python log file

import logging
logging.basicConfig(filename='example.log', encoding='utf-8', level=logging.DEBUG)
logging.debug('This message should go to the log file')
logging.info('So should this')
logging.warning('And this, too')
logging.error('And non-ASCII stuff, too, like Øresund and Malmö')

python logger format

FORMAT = '%(asctime)s %(clientip)-15s %(user)-8s %(message)s'
logging.basicConfig(format=FORMAT)
d = {'clientip': '192.168.0.1', 'user': 'fbloggs'}
logger = logging.getLogger('tcpserver')
logger.warning('Protocol problem: %s', 'connection reset', extra=d)

logging python

logging.basicConfig(filename='example.log', filemode='w', level=logging.DEBUG)

python fme logger

logger = fmeobjects.FMELogFile()
logger.logMessageString("{}".format('Error'), fmeobjects.FME_ERROR)