logger.py

import logging
import sys

class CustomFormatter(logging.Formatter):
    """Logging Formatter to add colors and count warning / errors"""

    grey = "\x1b[38;21m"
    yellow = "\x1b[33;21m"
    red = "\x1b[31;21m"
    bold_red = "\x1b[31;1m"
    reset = "\x1b[0m"
    format = "%(asctime)s - %(name)s - %(levelname)s - %(message)s (%(filename)s:%(lineno)d)"

    FORMATS = {
        logging.DEBUG: grey + format + reset,
        logging.INFO: grey + format + reset,
        logging.WARNING: yellow + format + reset,
        logging.ERROR: red + format + reset,
        logging.CRITICAL: bold_red + format + reset
    }

    def format(self, record):
        log_fmt = self.FORMATS.get(record.levelno)
        formatter = logging.Formatter(log_fmt)
        return formatter.format(record)

# create logger with 'spam_application'
logger = logging.getLogger("Sample")

# create console handler with a higher log level
ch = logging.StreamHandler()
ch.setLevel(logging.DEBUG)

if len(sys.argv)> 1:
    if sys.argv[1] == 'log':
        ch.setFormatter(logging.Formatter('%(asctime)s : %(levelname)s : %(name)s : %(message)s'))
    elif sys.argv[1] == 'color':
        ch.setFormatter(CustomFormatter())

if len(sys.argv) > 2:
    logger.setLevel(logging.__getattribute__(sys.argv[2]))
else:
    logger.setLevel(logging.DEBUG)

logger.addHandler(ch)

# logger.debug("debug message")
# logger.info("info message")
# logger.warning("warning message")
# logger.error("error message")
# logger.critical("critical message")

import random
import time
for _ in range(100):
    i = random.randint(0, 10)
    if i <= 4:
        logger.info("Value is {} - Everything is fine".format(i))
    elif i <= 6:
        logger.warning("Value is {} - System is getting hot".format(i))
    elif i <= 8:
        logger.error("Value is {} - Dangerous region".format(i))
    else:
        logger.critical("Maximum value reached")
    time.sleep(0.3)