python 通过logging写入日志到文件和控制台的实例

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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