python 日志模块logging

logging模块的四大组件

组件名称	对应类名	功能描述
日志器	Logger	提供了应用程序可一直使用的接口
处理器	Handler	将logger创建的日志记录发送到合适的目的输出
过滤器	Filter	提供了更细粒度的控制工具来决定输出哪条日志记录，丢弃哪条日志记录
格式器	Formatter	决定日志记录的最终输出格式

import logging
from logging import handlers
logger = logging.getLogger() #先实例化一个logger对象，先创建一个办公室

logger.setLevel(logging.DEBUG) #设置日志的级别的人
cl = logging.StreamHandler() #负责往控制台输出的人
bl = handlers.TimedRotatingFileHandler(filename='a.log',when='S',interval=1,backupCount=5,encoding='utf-8')
# when，按什么单位
#S 秒
# M 分
# H 小时、
# D 天、
# W 每星期（interval==0时代表星期一）

# midnight - roll over at midnight

# W{0-6} - roll over on a certain day; 0 - Monday

fmt = logging.Formatter('%(asctime)s - %(pathname)s[line:%(lineno)d] - %(levelname)s: %(message)s')
cl.setFormatter(fmt) #设置控制台输出的日志格式
bl.setFormatter(fmt) #设置文件里面写入的日志格式
logger.addHandler(cl) #把已经调教好的人放到办公室里
logger.addHandler(bl) ##把已经调教好的人放到办公室里
#指定日志的格式
logger.debug('我是debug。。。')
logger.warning('我是waring。。。')

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日志格式

    %(name)s            Name of the logger (logging channel)
    %(levelno)s         Numeric logging level for the message (DEBUG, INFO,
                        WARNING, ERROR, CRITICAL)
    %(levelname)s       Text logging level for the message ("DEBUG", "INFO",
                        "WARNING", "ERROR", "CRITICAL")
    %(pathname)s        Full pathname of the source file where the logging
                        call was issued (if available)
    %(filename)s        Filename portion of pathname
    %(module)s          Module (name portion of filename)
    %(lineno)d          Source line number where the logging call was issued
                        (if available)
    %(funcName)s        Function name
    %(created)f         Time when the LogRecord was created (time.time()
                        return value)
    %(asctime)s         Textual time when the LogRecord was created
    %(msecs)d           Millisecond portion of the creation time
    %(relativeCreated)d Time in milliseconds when the LogRecord was created,
                        relative to the time the logging module was loaded
                        (typically at application startup time)
    %(thread)d          Thread ID (if available)
    %(threadName)s      Thread name (if available)
    %(process)d         Process ID (if available)
    %(message)s         The result of record.getMessage(), computed just as
                        the record is emitted