python 通过logging写入日志到文件和控制台的实例

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如下所示：

import logging 

# 创建一个logger 
logger = logging.getLogger('mylogger') 
logger.setLevel(logging.DEBUG) 
# 创建一个handler，用于写入日志文件 
fh = logging.FileHandler('test.log') 
fh.setLevel(logging.DEBUG) 
# 再创建一个handler，用于输出到控制台 
ch = logging.StreamHandler() 
ch.setLevel(logging.DEBUG) 
# 定义handler的输出格式 
formatter = logging.Formatter('[%(asctime)s][%(thread)d][%(filename)s][line: %(lineno)d][%(levelname)s] ## %(message)s')
fh.setFormatter(formatter) 
ch.setFormatter(formatter) 
# 给logger添加handler 
logger.addHandler(fh) 
logger.addHandler(ch) 
# 记录一条日志 
logger.info('foorbar')

关于formatter的配置，采用的是%(<dict key>)s的形式，就是字典的关键字替换。提供的关键字包括：

Format	Description
%(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).
%(funcName)s	Name of function containing the logging call.
%(lineno)d	Source line number where the logging call was issued (if available).
%(created)f	Time when the LogRecord was created (as returned by time.time()).
%(relativeCreated)d	Time in milliseconds when the LogRecord was created, relative to the time the logging module was loaded.
%(asctime)s	Human-readable time when the LogRecord was created. By default this is of the form “2003-07-08 16:49:45,896” (the numbers after the comma are millisecond portion of the time).
%(msecs)d	Millisecond portion of the time when the LogRecord was created.
%(thread)d	Thread ID (if available).
%(threadName)s	Thread name (if available).
%(process)d	Process ID (if available).
%(message)s	The logged message, computed as msg % args.

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