Create new log file for everyday using python logging

问题

My python code works fine to create a log file with name and date on which code was executed -

For example-

I run code today it will create log file - logfile_2020-01-15.log

I run code tomorrow it will create log file - logfile_2020-01-16.log and so on.

Now the concern is, if my code execution is started today and it keeps on running for 8 days. It should create 8 log files - 1 file each day: logfile_2020-01-15.log to logfile_2020-01-23.log

But this is not happening. It keeps on logging in same file: logfile_2020-01-15.log when the code was initiated.

Please can anyone help me modify code-

import datetime
import logging
import schedule
class Workflow:    

    def setupLoggingToFile():
        logFilePath = "C:\ExceptionLogFiles\"
        logdate = datetime.datetime.now().strftime('%Y-%m-%d')
        logging.basicConfig(
            format='%(asctime)s %(name)-12s %(levelname)-8s %(message)s',
            datefmt='%m-%d-%y %H:%M:%S',
            level=logging.DEBUG,
            handlers=[RotatingFileHandler(logFilePath + "logfile_"+logdate+".log",maxBytes=10485760, backupCount=100)])   

    def StartWorkflow(self):
        try:
            print("New Cron Cycle Started..")
        except Exception:
            logging.exception("Something went wrong.", exc_info=True)

    def StartCron(self):
        try:
            schedule.every(5).seconds.do(self.StartWorkflow)
            while 1:
                schedule.run_pending()
                time.sleep(1)
        except Exception:
            logging.debug("CRON was unable to start. Something Wrong in StartCron function.")
            logging.exception("CRON was unable to start. Something Wrong in StartCron function.", exc_info=True)


A = Workflow()
A.StartCron()

回答1:

I would clean up the code a little bit and re-write it this way. New logs are rotated and appended the date/time at the end of the file.

>>> def logSetup ():
...    logger = logging.getLogger('testlog')
...    logger.setLevel(logging.DEBUG)
...    formatter = logging.Formatter(fmt='%(asctime)s %(name)-12s %(levelname)-8s %(message)s',
...                                  datefmt='%m-%d-%y %H:%M:%S')
...    fh = TimedRotatingFileHandler('/Documents/projects/python/testlog.log', when='S', interval=5)
...    fh.setFormatter(formatter)
...    logger.addHandler(fh)
...    return logger

In your case, you would need to change the following line to:

fh = TimedRotatingFileHandler('/Documents/projects/python/testlog.log', when='midnight')

Writing to log file and simulating log rotate every 5 seconds.

>>> for i in range (20):
...    logger.debug('%d Writing some logs' % i)
...    sleep (1)
...

The results become:

$ cat testlog.log.2020-01-15_18-35-01
01-15-20 18:36:24 testlog      DEBUG    0 Writing some logs
01-15-20 18:36:25 testlog      DEBUG    1 Writing some logs
01-15-20 18:36:26 testlog      DEBUG    2 Writing some logs
01-15-20 18:36:27 testlog      DEBUG    3 Writing some logs
01-15-20 18:36:28 testlog      DEBUG    4 Writing some logs
$ cat testlog.log.2020-01-15_18-36-24
01-15-20 18:36:29 testlog      DEBUG    5 Writing some logs
01-15-20 18:36:30 testlog      DEBUG    6 Writing some logs
01-15-20 18:36:31 testlog      DEBUG    7 Writing some logs
01-15-20 18:36:32 testlog      DEBUG    8 Writing some logs
01-15-20 18:36:33 testlog      DEBUG    9 Writing some logs
$ cat testlog.log.2020-01-15_18-36-29
01-15-20 18:36:34 testlog      DEBUG    10 Writing some logs
01-15-20 18:36:35 testlog      DEBUG    11 Writing some logs
01-15-20 18:36:36 testlog      DEBUG    12 Writing some logs
01-15-20 18:36:37 testlog      DEBUG    13 Writing some logs
01-15-20 18:36:38 testlog      DEBUG    14 Writing some logs
$ cat testlog.log.2020-01-15_18-36-34
01-15-20 18:36:39 testlog      DEBUG    15 Writing some logs
01-15-20 18:36:40 testlog      DEBUG    16 Writing some logs
01-15-20 18:36:41 testlog      DEBUG    17 Writing some logs
01-15-20 18:36:42 testlog      DEBUG    18 Writing some logs
01-15-20 18:36:43 testlog      DEBUG    19 Writing some logs
$ cat testlog.log
01-15-20 18:36:39 testlog      DEBUG    15 Writing some logs
01-15-20 18:36:40 testlog      DEBUG    16 Writing some logs
01-15-20 18:36:41 testlog      DEBUG    17 Writing some logs
01-15-20 18:36:42 testlog      DEBUG    18 Writing some logs
01-15-20 18:36:43 testlog      DEBUG    19 Writing some logs

来源：https://stackoverflow.com/questions/59760712/create-new-log-file-for-everyday-using-python-logging

标签

python

python-3.x

logging