Python日志模块学习，从这里开始...

import logging
logging.debug('This is debug message')
logging.info('This is info message')
logging.warning('This is warning message')
logging.error('This is error message')
logging.critical('This is critical message')
>>> WARNING:root:This is warning message
>>> ERROR:root:This is error message
>>> CRITICAL:root:This is critical message

import logging
logging.basicConfig(level=logging.DEBUG,
                    format='%(asctime)s %(filename)s[line:%(lineno)d] %(message)s', datefmt='%Y-%m-%d')
logging.debug('This is debug message')
logging.info('This is info message')
logging.warning('This is warning message')
logging.error('This is error message')
logging.critical('This is critical message')
>>> 2019-09-01 23:56:33 LearnLogging.py[line:38] This is debug message
>>> 2019-09-01 23:56:33 LearnLogging.py[line:39] This is info message
>>> 2019-09-01 23:56:33 LearnLogging.py[line:40] This is warning message
>>> 2019-09-01 23:56:33 LearnLogging.py[line:41] This is error message
>>> 2019-09-01 23:56:33 LearnLogging.py[line:42] This is critical message

import logging
logger = logging.getLogger(__name__)
logger.setLevel(level=logging.INFO)
formatter = logging.Formatter('%(asctime)s %(filename)s[line:%(lineno)d] %(message)s',
                              datefmt='%Y-%m-%d %H:%M:%S')
handler = logging.FileHandler("log.txt")
handler.setLevel(logging.INFO)
handler.setFormatter(formatter)
console = logging.StreamHandler()
console.setLevel(logging.INFO)
console.setFormatter(formatter)
logger.addHandler(handler)
logger.addHandler(console)
logger.debug('This is debug message')
logger.info('This is info message')
logger.warning('This is warning message')
logger.error('This is error message')
logger.critical('This is critical message')
>>> 2019-09-02 00:49:58 LearnLogging.py[line:62] This is info message
>>> 2019-09-02 00:49:58 LearnLogging.py[line:63] This is warning message
>>> 2019-09-02 00:49:58 LearnLogging.py[line:64] This is error message
>>> 2019-09-02 00:49:58 LearnLogging.py[line:65] This is critical message

import logging
from logging.handlers import RotatingFileHandler
logger = logging.getLogger(__name__)
logger.setLevel(level=logging.INFO)
formatter = logging.Formatter('%(asctime)s %(filename)s[line:%(lineno)d] %(message)s',
                              datefmt='%Y-%m-%d %H:%M:%S')
handler = RotatingFileHandler("log.txt", maxBytes=1024*3, backupCount=3)
handler.setLevel(logging.INFO)
handler.setFormatter(formatter)
console = logging.StreamHandler()
console.setLevel(logging.INFO)
console.setFormatter(formatter)
logger.addHandler(handler)
logger.addHandler(console)
for i in range(10):
    logger.info(i)
    logger.debug('This is debug message')
    logger.info('This is info message')
    logger.warning('This is warning message')
    logger.error('This is error message')
    logger.critical('This is critical message')

import logging
logger = logging.getLogger(__name__)
logger.setLevel(level=logging.INFO)
formatter = logging.Formatter('%(asctime)s %(filename)s[line:%(lineno)d] %(message)s',
                              datefmt='%Y-%m-%d %H:%M:%S')
console = logging.StreamHandler()
console.setLevel(logging.INFO)
console.setFormatter(formatter)
logger.addHandler(console)
try:
    1/0
except Exception as error:
    logger.error(error)
    logger.error(error, exc_info=True)
    logger.exception(error)
>>> 2019-09-02 01:06:15 LearnLogging.py[line:87] division by zero
>>> 2019-09-02 01:06:15 LearnLogging.py[line:89] division by zero
    Traceback (most recent call last):
      File "D:/Codes_Repository/Python/PythonTests/37.Python日志模块/LearnLogging.py", line 85, in <module>
        1/0
    ZeroDivisionError: division by zero
>>> 2019-09-02 01:06:15 LearnLogging.py[line:91] division by zero
    Traceback (most recent call last):
      File "D:/Codes_Repository/Python/PythonTests/37.Python日志模块/LearnLogging.py", line 85, in <module>
        1/0
    ZeroDivisionError: division by zero