python logging模块配置
日志级别对应值如下表所示。了解这些有助于你定义自己的日志级别的相对关系。如果你定义的级别与已有的数值相同，则原有的级别会被覆盖。级别
数值
CRITICAL
50
ERROR
40
WARNING
30
INFO
20
DEBUG
10
NOTSET
0 生成log的几个方法， 这几个方法安重要程度依次排开， logger的设置可以影响一部分呢不重要的内容记录到日志当中。
[*]debug(log_message, [*args[, **kwargs]])
[*]info(log_message, [*args[, **kwargs]])
[*]warning(log_message, [*args[, **kwargs]])
[*]error(log_message, [*args[, **kwargs]])
[*]critical(log_message, [*args[, **kwargs]])
[*]exception(message[, *args])
[*]log(log_level, log_message, [*args[, **kwargs]])
Handler 是处理器， 可以把log记录到文件系统中， 输出到终端设备， 或者网络sockt或者邮件等。
[*]StreamHandler
[*]FileHandler
[*]RotatingFileHandler
[*]TimedRotatingFileHandler
[*]SocketHandler
[*]DatagramHandler
[*]SysLogHandler
[*]NTEventLogHandler
[*]SMTPHandler
[*]MemoryHandler
[*]HTTPHandler
LoggerFormatter， log的格式， 使用这个可以更容易的根据错误检错。
[*]%(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)
[*]%(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)
[*]%(process)d Process ID (if available)
[*]%(message)s The result of record.getMessage(), computed just as
[*] the record is emitted
下面是一个简单的demo， 其中使用了两个handler分别将log记录到标准输出和文件中,因为handler是可以加多个的额， 所以你可以任意添加自己的handler。
[*]#!/usr/bin/env python
[*]
[*]import logging
[*]
[*]#create logger
[*]logger = logging.getLogger("simple_example")
[*]logger.setLevel(logging.DEBUG)
[*]#create console handler and set level to error
[*]ch = logging.StreamHandler()
[*]ch.setLevel(logging.ERROR)
[*]#create file handler and set level to debug
[*]fh = logging.FileHandler("spam.log")
[*]fh.setLevel(logging.DEBUG)
[*]#create formatter
[*]formatter = logging.Formatter("%(asctime)s - %(name)s - %(levelname)s -
[*] %(message)s")
[*]#add formatter to ch and fh
[*]ch.setFormatter(formatter)
[*]fh.setFormatter(formatter)
[*]#add ch and fh to logger
[*]logger.addHandler(ch)
[*]logger.addHandler(fh)
[*]
[*]#"application" code
[*]logger.debug("debug message")
[*]logger.info("info message")
[*]logger.warn("warn message")
[*]logger.error("error message")
[*]logger.critical("critical message")
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