How do I format my output in the datetime module?

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So, I'm just messing around with the datetime and logging module in python3 and I'm trying to get timestamps from the datatime module to appear along with the logging event.

I want the output to look like: 7/16/20 22:18:20 DEBUG Test1 debug message

My problem: I can't get the data and time to appear to the left of my logging events.

from datetime import datetime

logging.basicConfig(level=logging.DEBUG,
                    datefmt='%m/%d/%Y %H:%M:%S',
                    filemode='a')


def set_logger(name):
    date_str = datetime.now().strftime("%Y_%m_%d")
    file_name = name + "_" + date_str
    if file_name:
        logger = logging.getLogger(name)
        logger.addHandler(logging.FileHandler(file_name))
        return logger


logger = set_logger("Test1")

logger.debug('Test1 debug message')
logger.info('Test1 info message')
logger.warning('Test1 warning message')
logger.error('Test1 error message')

logger = set_logger("Test2")

logger.debug('Test2 debug message')
logger.info('Test2 info message')
logger.warning('Test2 warning message')
logger.error('Test2 error message')


logger = set_logger("Test3")

logger.debug('Test3 debug message')
logger.info('Test3 info message')
logger.warning('Test3 warning message')
logger.error('Test3 error message')

Even with date_str being added to file_name it still won't print in my console. :/

logging datetime python
1 Answers

Always read the documentation carefully, I know it can be tedious (especially with dates and times) but it will usually be a huge help in the future.

The basicConfig method from the logging module can take a format option. It is initialized as formatted string that looks like

FORMAT = '%(asctime)s: %(levelname)s: %(message)s'

Now that the format is initialized you can pass it into the format option inside the basicConfig as

logging.basicConfig(level=logging.DEBUG,
                    format=FORMAT, 
                    datefmt='%m/%d/%Y %H:%M:%S',
                    filemode='a')

That should give you the desired output of 07/16/2020 21:40:23: DEBUG: Test1 debug message... and so on

You also don't need that if statement in your set_logger function either

So your code should look like :

import logging
from datetime import datetime

FORMAT = '%(asctime)s: %(levelname)s: %(message)s'

logging.basicConfig(level=logging.DEBUG,
                    format=FORMAT,
                    datefmt='%m/%d/%Y %H:%M:%S',
                    filemode='a')


def set_logger(name):
    date_str = datetime.now().strftime("%Y_%m_%d")
    file_name = name + "_" + date_str
    logger = logging.getLogger(name)
    logger.addHandler(logging.FileHandler(file_name))
    return logger


logger = set_logger("Test1")

logger.debug('Test1 debug message')
logger.info('Test1 info message')
logger.warning('Test1 warning message')
logger.error('Test1 error message')

logger = set_logger("Test2")

logger.debug('Test2 debug message')
logger.info('Test2 info message')
logger.warning('Test2 warning message')
logger.error('Test2 error message')


logger = set_logger("Test3")

logger.debug('Test3 debug message')
logger.info('Test3 info message')
logger.warning('Test3 warning message')
logger.error('Test3 error message')

You can read the docs here: https://docs.python.org/3/library/logging.html#logging.Formatter https://docs.python.org/3/library/datetime.html

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