python的日志处理

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简单的日志处理示例

import loggingLOG_FILENAME = 'example.log'logging.basicConfig(filename=LOG_FILENAME,level=logging.DEBUG)logging.debug('This message should go to the log file')##输出DEBUG:root:This message should go to the log file

在上面的示例中，会看到所有的日志信息都包含一个root，root就是一个logger名称，在日志模块中可以设置不同的logger，每个logger可以有不同的配置，但是每个新的logger会“继承”logging模块的

import logginglogging.basicConfig(level=logging.WARNING)logger1 = logging.getLogger('package1.module1')logger2 = logging.getLogger('package2.module2')logger1.warning('This message comes from one module')logger2.warning('And this message comes from another module')

输出:

    WARNING:package1.module1:This message comes from one module    WARNING:package2.module2:And this message comes from another module

python日志的配置方法

python的日志配置有三种方法：
1、显式创建loggers，handlers，foramtters对象，调用对应的配置方法
2、创建logging配置文件，用fileConfig()函数读取配置文件
3、创建配置信息字典，将其传给dictConfig()函数

方法一：

    import logging    # create logger    logger = logging.getLogger("simple_example")    logger.setLevel(logging.DEBUG)    # create console handler and set level to debug    ch = logging.StreamHandler()    ch.setLevel(logging.DEBUG)    # create formatter    formatter = logging.Formatter("%(asctime)s - %(name)s - %(levelname)s - %(message)s")    # add formatter to ch    ch.setFormatter(formatter)    # add ch to logger    logger.addHandler(ch)    # "application" code    logger.debug("debug message")    logger.info("info message")    logger.warn("warn message")    logger.error("error message")    logger.critical("critical message")

输出：

    2016-02-02 15:43:44,575 - simple_example - DEBUG - debug message    2016-02-02 15:43:44,578 - simple_example - INFO - info message    2016-02-02 15:43:44,578 - simple_example - WARNING - warn message    2016-02-02 15:43:44,578 - simple_example - ERROR - error message    2016-02-02 15:43:44,578 - simple_example - CRITICAL - critical message

方法二：

    import logging    import logging.config    logging.config.fileConfig("logging.conf")    # create logger    logger = logging.getLogger("simpleExample")    # "application" code    logger.debug("debug message")    logger.info("info message")    logger.warn("warn message")    logger.error("error message")    logger.critical("critical message")

logging.conf 文件

[loggers]keys=root,simpleExample[handlers]keys=consoleHandler[formatters]keys=simpleFormatter[logger_root]level=DEBUGhandlers=consoleHandler[logger_simpleExample]level=DEBUGhandlers=consoleHandlerqualname=simpleExamplepropagate=0[handler_consoleHandler]class=StreamHandlerlevel=DEBUGformatter=simpleFormatterargs=(sys.stdout,)[formatter_simpleFormatter]format=%(asctime)s - %(name)s - %(levelname)s - %(message)sdatefmt=

输出：

    2016-02-02 16:28:41,075 - simpleExample - DEBUG - debug message    2016-02-02 16:28:41,075 - simpleExample - INFO - info message    2016-02-02 16:28:41,075 - simpleExample - WARNING - warn message    2016-02-02 16:28:41,075 - simpleExample - ERROR - error message    2016-02-02 16:28:41,075 - simpleExample - CRITICAL - critical message

方法三

import loggingimport logging.configimport yaml#logging.config.fileConfig("logging.conf")input = yaml.load(file('dict.conf'))logging.config.dictConfig(input)# create loggerlogger = logging.getLogger("simpleExample")# "application" codelogger.debug("debug message")logger.info("info message")logger.warn("warn message")logger.error("error message")logger.critical("critical message")

dict.conf文件：

version: 1formatters:  simple:    format: format=%(asctime)s - %(name)s - %(levelname)s - %(message)shandlers:  console:    class: logging.StreamHandler    level: DEBUG    formatter: simple    stream: ext://sys.stdoutloggers:  simpleExample:    level: DEBUG    handlers: [console]    propagate: no root:    level: DEBUG    handlers: [console]

输出：

format=2016-02-02 17:09:54,104 - simpleExample - DEBUG - debug messageformat=2016-02-02 17:09:54,104 - simpleExample - INFO - info messageformat=2016-02-02 17:09:54,104 - simpleExample - WARNING - warn messageformat=2016-02-02 17:09:54,104 - simpleExample - ERROR - error messageformat=2016-02-02 17:09:54,104 - simpleExample - CRITICAL - critical message

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