Using configuration file to record Python program log

bjehp 2020-11-16 21:12:31
using configuration file record python


Developers can configure logging in three ways :

  1. Call the configuration method Python The code explicitly creates the logger 、 Handler and formatter .
  2. Create a log profile and use fileConfig() Function read .
  3. Create a configuration information dictionary and pass it to dictConfig() function .

Relative to the first kind , The second way to use configuration files is more advantageous , Mainly the separation of configuration and code , More clearly structured , And the ability of non developers to easily modify logging properties .

This article will introduce the second way to use configuration file to record Python Program log , take Python The program log is printed to the console and log file respectively , Log files are iterated by timestamp , And can automatically delete expired files .

Configuration file mode print log

First create the configuration file logging.conf, Here are the contents of the document . Here we mainly introduce TimedRotatingFileHandler Configuration parameters for args, The first parameter /var/log/demo3/example.log Represents the file directory of the log output , The second parameter d Represents iteration of log files in days , The third parameter 1 Said every 1 A cycle , Multiply the second and third parameters to iterate a log file every few cycles , Fourth parameter 3 Indicates that only three log files are kept , Log files that exceed this value are automatically cleared .

[loggers]
keys=root
[handlers]
keys=consoleHandler,timedRotatingFileHandler
[formatters]
keys=simpleFormatter
[logger_root]
level=INFO
handlers=consoleHandler,timedRotatingFileHandler
[handler_consoleHandler]
class=StreamHandler
level=INFO
formatter=simpleFormatter
args=(sys.stdout,)
[handler_timedRotatingFileHandler]
class=handlers.TimedRotatingFileHandler
level=INFO
formatter=simpleFormatter
args=('/var/log/demo3/example.log','d',1,3)
[formatter_simpleFormatter]
format=%(asctime)s %(name)s %(levelname)s - %(message)s
datefmt=

To write Python Program , Use fileConfig() Function to read the configuration file , Test printing various types of logs . You can see that the log is printed using the configuration file , The program structure is clear .

import logging.config
logging.config.fileConfig('logging.conf')
# create logger
logger = logging.getLogger()
logger.debug('debug message')
logger.info('info message')
logger.warning('warn message')
logger.error('error message')
logger.critical('critical message')

function Python Program , The console and log files output the following :

2020-11-03 20:50:49,434 simple_example.py INFO - info message
2020-11-03 20:50:49,435 simple_example.py WARNING - warn message
2020-11-03 20:50:49,435 simple_example.py ERROR - error message
2020-11-03 20:50:49,435 simple_example.py CRITICAL - critical message

Reference material

https://docs.python.org/zh-cn/3/howto/logging.html#logging-advanced-tutorial Advanced journal tutorial

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