python 透過logging寫入日誌到檔案和控制台的實例

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如下：

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')

關於formatter的配置，採用的是%( 1dea5f48fed82ca0e7a5493fa56c2e35)s的形式，就是字典的關鍵字替換。提供的關鍵字包括：

Numeric logging level for the message (Text logging level for the message ('DEBUG', 'WARNING', 'ERROR').Full pathname of the source file where the logging call was issued (if available).Filename portion of pathname.time.time()LogRecord##%(msecs)d#Millisecond was created.

Format	Description
	#%(name)sName of the logger (logging channel).
%(levelno)s	DEBUG, INFO, WARNING, ERROR, CRITICAL).
%(levelname)s
'INFO',
, 'CRITICAL'
#%(pathname)s
%(filename)s
#%(module)s##Module ( name portion of filename).	%(funcName)sName 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
).	%(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
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
%(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######.################相關推薦：############python實作log日誌的範例程式碼############淺聊python日誌的設定檔路徑問題########################### ##########

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