# -*- 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')  # 例項化handler
fmt = '%(asctime)s - %(levelname)s - %(message)s'

formatter = logging.Formatter(fmt)  # 例項化formatter
handler.setFormatter(formatter)  # 為handler新增formatter
 


logger = logging.getLogger('tst')  # 獲取名為tst的logger
logger.addHandler(handler)  # 為logger新增handler
logger.setLevel(logging.DEBUG)

logger.info(u'輸出中文試一試')
logger.debug('first debug message')

注意在 logging.handlers.RotatingFileHandler 此處要設定 encoding 格式，否則輸出日誌中的中文會亂碼

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 - 輸出中文試一試
2018-01-18 10:58:10,126 - DEBUG - first debug
 
 message

參考資料：