Python3 中记录日志并输出到 log 文件中的方法（防止输出中文乱码）

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

import logging.handlers


LOG_FILE = r'tst.log'

handler = logging.handlers.RotatingFileHandler(LOG_FILE, maxBytes=1024 * 1024, backupCount=5, encoding='utf-8')  # 实例化handler
fmt = '%(asctime)s - %(levelname)s - %(message)s'

formatter = logging.Formatter(fmt)  # 实例化formatter
handler.setFormatter(formatter)  # 为handler添加formatter

logger = logging.getLogger('tst')  # 获取名为tst的logger
logger.addHandler(handler)  # 为logger添加handler
logger.setLevel(logging.DEBUG)

logger.info(u'输出中文试一试')
logger.debug('first debug message')

注意在 logging.handlers.RotatingFileHandler 此处要设置 encoding 格式，否则输出日志中的中文会乱码

2018-01-18 10:52:44,281 - INFO - ���������һ��
2018-01-18 10:52:44,281 - DEBUG - first debug message
2018-01-18 10:53:42,002 - INFO - ���������һ��
2018-01-18 10:53:42,003 - DEBUG - first debug message
2018-01-18 10:54:54,226 - INFO - ���������һ��
2018-01-18 10:54:54,226 - DEBUG - first debug message
2018-01-18 10:58:10,126 - INFO - 输出中文试一试
2018-01-18 10:58:10,126 - DEBUG - first debug message

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参考资料：

1、Python日志输出——logging模块
http://blog.youkuaiyun.com/chosen0ne/article/details/7319306

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