有没有一种方法可以更改未使用basicConfig配置的记录器对象的文件模式? [英] Is there a way to change the filemode for a logger object that is not configured using basicConfig?

问题描述

如果使用logger = logging.getLogger("Name")创建记录器对象，则无法将文件模式从append('a')更改为写入('w').如果可以将root记录程序与basicConfig一起使用，则可以，但是当我想要的只是我自己的消息(从DEBUG级别开始)时，就会记录很多系统调试消息.

If I create a logger object by using logger = logging.getLogger("Name") I am unable to change the filemode from append('a') to write ('w'). I can if I use the root logger with basicConfig, but then I get a lot of system debug messages being logged when all I want is my own messages beginning at the DEBUG level.

我希望(1)将自己的记录器对象的文件模式更改为"w"或(2)将过滤器添加到根记录器.甚至有可能从根记录器中过滤掉这些调试消息吗?

I am hoping to either (1) change the filemode for my own logger object to 'w' or (2) add a filter to the root logger. Is it even possible to filter out these debug messages from the root logger?

def create_log():
    # create logger for "Sample App"
    logger = logging.getLogger('automated_testing')
    logger.setLevel(logging.DEBUG)

    # create file handler which logs even debug messages
    fh = logging.FileHandler('results.log')
    fh.setLevel(logging.DEBUG)
    # create console handler with a higher log level
    ch = logging.StreamHandler(stream=sys.stdout)
    ch.setLevel(logging.DEBUG)
    # create formatter and add it to the handlers
    formatter = logging.Formatter('[%(asctime)s] %(levelname)8s --- %(message)s ' +
                                  '(%(filename)s:%(lineno)s)',datefmt='%Y-%m-%d %H:%M:%S')
    fh.setFormatter(formatter)
    ch.setFormatter(formatter)
    # add the handlers to the logger
    logger.addHandler(ch)
    logger.addHandler(fh)

    return logger

推荐答案

类似的东西

import sys
import logging

def create_logger():
    # create logger for "Sample App"
    logger = logging.getLogger('automated_testing')
    logger.setLevel(logging.DEBUG)

    # create file handler which logs even debug messages
    fh = logging.FileHandler('results.log', mode='w')
    fh.setLevel(logging.DEBUG)

    # create console handler with a higher log level
    ch = logging.StreamHandler(stream=sys.stdout)
    ch.setLevel(logging.INFO)

    # create formatter and add it to the handlers
    formatter = logging.Formatter('[%(asctime)s] %(levelname)8s --- %(message)s ' +
                                  '(%(filename)s:%(lineno)s)',datefmt='%Y-%m-%d %H:%M:%S')
    fh.setFormatter(formatter)
    ch.setFormatter(formatter)

    # add the handlers to the logger
    logger.addHandler(ch)
    logger.addHandler(fh)

    return logger

logger = create_logger()


logger.log(logging.NOTSET,   "NOTSET   Message - 0")
logger.log(logging.DEBUG,    "DEBUG    Message - 10")
logger.log(logging.INFO,     "INFO     Message - 20")
logger.log(logging.WARNING,  "WARNING  Message - 30")
logger.log(logging.CRITICAL, "CRITICAL Message - 40")

打印到标准输出:

[2015-03-16 17:51:08]     INFO --- INFO     Message - 20 (temp3.py:34)
[2015-03-16 17:51:08]  WARNING --- WARNING  Message - 30 (temp3.py:35)
[2015-03-16 17:51:08] CRITICAL --- CRITICAL Message - 40 (temp3.py:36)

写(不附加)到results.log:

Writes (not appends) to results.log:

[2015-03-16 17:51:08]    DEBUG --- DEBUG    Message - 10 (temp3.py:33)
[2015-03-16 17:51:08]     INFO --- INFO     Message - 20 (temp3.py:34)
[2015-03-16 17:51:08]  WARNING --- WARNING  Message - 30 (temp3.py:35)
[2015-03-16 17:51:08] CRITICAL --- CRITICAL Message - 40 (temp3.py:36)

DEBUG +记录在results.txt中，而只有 INFO +发送到stdout.

DEBUG+ are logged in results.txt while only INFO+ are send to stdout.

请注意，由于您在根记录器上没有任何处理程序，因此将 NOTSET 日志条目传递到根记录器，然后将其丢弃.

Note that the NOTSET log entry is passed up to the root logger then, since you don't have any handlers on the root logger, discarded.

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