Python logging模組

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# -*- coding: utf-8 -*-

import logging
import sys

# 擷取logger執行個體，如果參數為空白則返回root logger
logger = logging.getLogger("AppName")

# 指定logger輸出格式
formatter = logging.Formatter(‘%(asctime)s %(levelname)-8s: %(message)s‘)

# 檔案日誌
file_handler = logging.FileHandler("test.log")
file_handler.setFormatter(formatter)  # 可以通過setFormatter指定輸出格式

# 控制台日誌
console_handler = logging.StreamHandler(sys.stdout)
console_handler.formatter = formatter  # 也可以直接給formatter賦值

# 為logger添加的Tlog器
logger.addHandler(file_handler)
logger.addHandler(console_handler)

# 指定日誌的最低輸出層級，預設為WARN層級
logger.setLevel(logging.INFO)

# 輸出不同層級的log
logger.debug(‘this is debug info‘)
logger.info(‘this is information‘)
logger.warn(‘this is warning message‘)
logger.error(‘this is error message‘)
logger.fatal(‘this is fatal message, it is same as logger.critical‘)
logger.critical(‘this is critical message‘)

# 2016-10-08 21:59:19,493 INFO    : this is information
# 2016-10-08 21:59:19,493 WARNING : this is warning message
# 2016-10-08 21:59:19,493 ERROR   : this is error message
# 2016-10-08 21:59:19,493 CRITICAL: this is fatal message, it is same as logger.critical
# 2016-10-08 21:59:19,493 CRITICAL: this is critical message

# 移除一些Tlog器
logger.removeHandler(file_handler)

Python logging模組