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如想看详细说明，请到：
1.https://www.cnblogs.com/yyds/p/6901864.html
2.https://docs.python.org/2/library/logging.html
我只做简单使用介绍
日志有等级设置
如果设置的等级为3,则高于3级的会输出，其它的不会输出，但是如何设置呢？
logger = logging.getLogger()
logger.setLevel(logging.CRITICAL)
logging.info("this is info")
logging.debug("this is debug")
logging.warning("this is warning")
logging.error("this is error")
logging.critical("this is critical")
但是，为了看日志得瞅着运行记录盯一天，眼睛实在受不了，这时候，我们可以把日志写到文档里，如何写呢？
logger = logging.getLogger(__name__)
logger.setLevel(level=logging.INFO)
handler = logging.FileHandler("ly.log")
handler.setLevel(logging.INFO)
formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
handler.setFormatter(formatter)
console = logging.StreamHandler()
console.setLevel(logging.INFO)
logger.addHandler(handler)
logger.addHandler(console)
logger.info("this is the blog of the system") | 
转播
