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python 通过logging写入日志到文件和控制台的实例

作者：jingxian　　发布时间：2021-04-26 00:04:38　

标签：python,logging,文件,控制台

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：

FormatDescription
％(name)sName of the logger (logging channel).
％(levelno)sNumeric logging level for the message (DEBUG, INFO, WARNING, ERROR, CRITICAL).
％(levelname)sText logging level for the message ('DEBUG', 'INFO', 'WARNING', 'ERROR', 'CRITICAL').
％(pathname)sFull pathname of the source file where the logging call was issued (if available).
％(filename)sFilename portion of pathname.
％(module)sModule (name portion of filename).
％(funcName)sName of function containing the logging call.
％(lineno)dSource line number where the logging call was issued (if available).
％(created)fTime when the LogRecord was created (as returned by time.time()).
％(relativeCreated)dTime in milliseconds when the LogRecord was created, relative to the time the logging module was loaded.
％(asctime)sHuman-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)dMillisecond portion of the time when the LogRecord was created.
％(thread)dThread ID (if available).
％(threadName)sThread name (if available).
％(process)dProcess ID (if available).
％(message)sThe logged message, computed as msg ％ args.

来源：https://blog.csdn.net/shjh369/article/details/50585505

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