How to Customize the time format for Python logging?

user_459745 0
Viewed 203774

I am new to Python's logging package and plan to use it for my project. I would like to customize the time format to my taste. Here is a short code I copied from a tutorial:

import logging

# create logger
logger = logging.getLogger("logging_tryout2")
logger.setLevel(logging.DEBUG)

# create console handler and set level to debug
ch = logging.StreamHandler()
ch.setLevel(logging.DEBUG)

# create formatter
formatter = logging.Formatter("%(asctime)s;%(levelname)s;%(message)s")

# add formatter to ch
ch.setFormatter(formatter)

# add ch to logger
logger.addHandler(ch)

# "application" code
logger.debug("debug message")
logger.info("info message")
logger.warn("warn message")
logger.error("error message")
logger.critical("critical message")

And here is the output:

2010-07-10 10:46:28,811;DEBUG;debug message
2010-07-10 10:46:28,812;INFO;info message
2010-07-10 10:46:28,812;WARNING;warn message
2010-07-10 10:46:28,812;ERROR;error message
2010-07-10 10:46:28,813;CRITICAL;critical message

I would like to shorten the time format to just: '2010-07-10 10:46:28', dropping the mili-second suffix. I looked at the Formatter.formatTime, but confused. I appreciate your help to achieve my goal. Thank you.

formatting logging datetime python
6 Answers

Try These Formats:

Format 1:

'formatters': {
        'standard': {
            'format' : '%(asctime)s |:| LEVEL: %(levelname)s |:| FILE PATH: %(pathname)s |:| FUNCTION/METHOD: %(funcName)s %(message)s |:| LINE NO.: %(lineno)d |:| PROCESS ID: %(process)d |:| THREAD ID: %(thread)d',
            'datefmt' : "%y/%b/%Y %H:%M:%S"
                    },
              }

Output of Format 1:

enter image description here



Format 2:

'formatters': {
        'standard': {
            'format' : '%(asctime)s |:| LEVEL: %(levelname)s |:| FILE PATH: %(pathname)s |:| FUNCTION/METHOD: %(funcName)s %(message)s |:| LINE NO.: %(lineno)d |:| PROCESS ID: %(process)d |:| THREAD ID: %(thread)d',
            'datefmt' : "%Y-%m-%d %H:%M:%S"
                    },
              }

Output of Format 2:

enter image description here

user_111834780

In order to customize time format while logging we can create a logger object and and a fileHandler to it.

        import logging
        from datetime import datetime

        logger = logging.getLogger("OSA")

        logger.setLevel(logging.DEBUG)

        filename = datetime.now().strftime("%Y-%m-%d %H:%M:%S") + ".log"
        fileHandler = logging.FileHandler(filename, mode="a")#'a' for append you can use 'w' for write

        formatter = logging.Formatter(
            "%(asctime)s : %(levelname)s : [%(filename)s:%(lineno)s - %(funcName)s()] : %(message)s",
            "%Y-%m-%d %H:%M:%S")

        fileHandler.setFormatter(formatter)
        logger.addHandler(fileHandler)
user_82348700
Related