python 日志输出模块--两种方法

第一种方法：（推荐）

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')

　　第二种方法：

LOG_FORMAT = "%(asctime)s - %(levelname)s - %(message)s"
DATE_FORMAT = "%m/%d/%Y %H:%M:%S %p"

logging.basicConfig(filename='my.log', level=logging.DEBUG, format=LOG_FORMAT, datefmt=DATE_FORMAT)

logging.debug("This is a debug log.")
logging.info("This is a info log.")
logging.warning("This is a warning log.")
logging.error("This is a error log.")
logging.critical("This is a critical log.")