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python 包之 logging 日志处理教程
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python 包之 logging 日志处理教程
原创一、基本方法
- 默认情况下日志打印只显示大于等于 WARNING 级别的日志
- FATAL：致命错误
- CRITICAL：特别糟糕的事情，如内存耗尽、磁盘空间为空，一般很少使用
- ERROR：发生错误时，如IO操作失败或者连接问题
- WARNING：发生很重要的事件，但是并不是错误时，如用户登录密码错误
- INFO：处理请求或者状态变化等日常事务
- DEBUG：调试过程中使用DEBUG等级，如算法中每个循环的中间状态
import logging
logging.debug('It is a debug')
logging.info('It is a info')
logging.warning('It is a warning')
logging.error('It is a Error')
logging.critical('It is a critical')
logging.debug('It is a debug')
logging.info('It is a info')
logging.warning('It is a warning')
logging.error('It is a Error')
logging.critical('It is a critical')
二、设置日志级别
import logging
logging.basicConfig(level=logging.DEBUG)
logging.debug('Python debug')
logging.basicConfig(level=logging.DEBUG)
logging.debug('Python debug')
三、将信息记录到文件
import logging
logging.basicConfig(filename='logging.text', level=logging.DEBUG)
logging.debug('It is a debug')
logging.info('It is a info')
logging.warning('It is a warning')
logging.basicConfig(filename='logging.text', level=logging.DEBUG)
logging.debug('It is a debug')
logging.info('It is a info')
logging.warning('It is a warning')
四、更改消息格式
- %(levelno)s：打印日志级别的数值
- %(levelname)s：打印日志级别的名称
- %(pathname)s：打印当前执行程序的路径，其实就是sys.argv[0]
- %(filename)s：打印当前执行程序名
- %(funcName)s：打印日志的当前函数
- %(lineno)d：打印日志的当前行号
- %(asctime)s：打印日志的时间
- %(thread)d：打印线程ID
- %(threadName)s：打印线程名称
- %(process)d：打印进程ID
- %(message)s：打印日志信息
import logging
logging.basicConfig(format='%(asctime)s %(message)s', datefmt='%m/%d/%Y %I:%M:%S %p')
logging.warning('is when this event was logged.')
logging.basicConfig(format='%(asctime)s %(message)s', datefmt='%m/%d/%Y %I:%M:%S %p')
logging.warning('is when this event was logged.')
五、配置日志
- 创建日志记录配置文件并使用该 fileConfig() 功能读取它
- logging.conf 配置文件：
[loggers]
keys=root,simpleExample
[handlers]
keys=consoleHandler
[formatters]
keys=simpleFormatter
[logger_root]
level=DEBUG
handlers=consoleHandler
[logger_simpleExample]
level=DEBUG
handlers=consoleHandler
qualname=simpleExample
propagate=0
[handler_consoleHandler]
class=StreamHandler
level=DEBUG
formatter=simpleFormatter
args=(sys.stdout,)
[formatter_simpleFormatter]
format=%(asctime)s - %(name)s - %(levelname)s - %(message)s
datefmt=
keys=root,simpleExample
[handlers]
keys=consoleHandler
[formatters]
keys=simpleFormatter
[logger_root]
level=DEBUG
handlers=consoleHandler
[logger_simpleExample]
level=DEBUG
handlers=consoleHandler
qualname=simpleExample
propagate=0
[handler_consoleHandler]
class=StreamHandler
level=DEBUG
formatter=simpleFormatter
args=(sys.stdout,)
[formatter_simpleFormatter]
format=%(asctime)s - %(name)s - %(levelname)s - %(message)s
datefmt=
import logging
import logging.config
logging.config.fileConfig('logging.conf')
logger = logging.getLogger('simpleExample')
logging.debug('It is a debug')
logging.info('It is a info')
logging.warning('It is a warning')
logging.error('It is a Error')
logging.critical('It is a critical')
import logging.config
logging.config.fileConfig('logging.conf')
logger = logging.getLogger('simpleExample')
logging.debug('It is a debug')
logging.info('It is a info')
logging.warning('It is a warning')
logging.error('It is a Error')
logging.critical('It is a critical')
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