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解決Python logging模塊無(wú)法正常輸出日志的問(wèn)題

 更新時(shí)間:2020年02月21日 10:11:22   作者:sxhlinux  
今天小編就為大家分享一篇解決Python logging模塊無(wú)法正常輸出日志的問(wèn)題,具有很好的參考價(jià)值,希望對(duì)大家有所幫助。一起跟隨小編過(guò)來(lái)看看吧

廢話少說(shuō),先上代碼

File:logger.conf
 
[formatters]
keys=default
 
[formatter_default]
format=%(asctime)s - %(name)s - %(levelname)s - %(message)s
class=logging.Formatter
 
[handlers]
keys=console, error_file
 
[handler_console]
class=logging.StreamHandler
formatter=default
args=tuple()
 
[handler_error_file]
class=logging.FileHandler
level=INFO
formatter=default
args=("logger.log", "a")
 
[loggers]
keys=root
 
[logger_root]
level=DEBUG
formatter=default
handlers=console,error_file
File:logger.py
 
#!/bin/env python
 
import logging
from logging.config import logging
 
class Test(object):
 """docstring for Test"""
 def __init__(self):
 logging.config.fileConfig("logger.conf")
 self.logger = logging.getLogger(__name__)
 
 def test_func(self):
 self.logger.error('test_func function')
 
class Worker(object):
 """docstring for Worker"""
 def __init__(self):
 logging.config.fileConfig("logger.conf")
 self.logger = logging.getLogger(__name__)
 
 data_logger = logging.getLogger('data')
 handler = logging.FileHandler('./data.log')
 fmt = logging.Formatter('%(asctime)s|%(message)s')
 handler.setFormatter(fmt)
 data_logger.addHandler(handler)
 data_logger.setLevel(logging.DEBUG)
 self.data_logger = data_logger
 
 def test_logger(self):
 self.data_logger.error("test_logger function")
 instance = Test()
 self.data_logger.error("test_logger output")
 instance.test_func()
 
 
def main():
 worker = Worker()
 worker.test_logger()
 
if __name__ == '__main__':
 main()

問(wèn)題一:測(cè)試過(guò)程中,只能打印出test_logger function一條語(yǔ)句

問(wèn)題二:明明只在data_logger中打印出語(yǔ)句,但是logger的日志中也出現(xiàn)了相關(guān)的日志。

問(wèn)題一解決方案:

利用python -m pdb logger.py 語(yǔ)句對(duì)腳本進(jìn)行調(diào)試發(fā)現(xiàn),在執(zhí)行instance = Test()語(yǔ)句后,通過(guò)print '\n'.join(['%s:%s' % item for item in self.data_logger.__dict__.items()])調(diào)試語(yǔ)句看到data_logger的disable屬性值由0變成了True,此時(shí)logger的對(duì)應(yīng)屬性也發(fā)生了相同的變化。這種變化導(dǎo)致了logger對(duì)象停止記錄日志。

參考python logging模塊的相關(guān)手冊(cè)發(fā)現(xiàn)

“The fileConfig() function takes a default parameter, disable_existing_loggers, which defaults to True for reasons of backward compatibility. This may or may not be what you want, since it will cause any loggers existing before the fileConfig() call to be disabled unless they (or an ancestor) are explicitly named in the configuration.”

的說(shuō)明,即調(diào)用fileconfig()函數(shù)會(huì)將之前存在的所有l(wèi)ogger禁用。

在python 2.7版本該fileConfig()函數(shù)添加了一個(gè)參數(shù),logging.config.fileConfig(fname, defaults=None, disable_existing_loggers=True),可以顯式的將disable_existing_loggers設(shè)置為FALSE來(lái)避免將原有的logger禁用。

將上述代碼中的Test類(lèi)中的logging.config.fileConfig函數(shù)改成logging.config.fileConfig("./logger.conf", disable_existing_loggers=0)就可以解決問(wèn)題。

不過(guò)該代碼中由于位于同一程序內(nèi),可以直接用logging.getLogger(LOGGOR_NAME)函數(shù)引用同一個(gè)logger,不用再調(diào)用logging.config.fileConfig函數(shù)重新加載一遍了。

問(wèn)題二解決方案:

logger對(duì)象有個(gè)屬性propagate,如果這個(gè)屬性為T(mén)rue,就會(huì)將要輸出的信息推送給該logger的所有上級(jí)logger,這些上級(jí)logger所對(duì)應(yīng)的handlers就會(huì)把接收到的信息打印到關(guān)聯(lián)的日志中。logger.conf配置文件中配置了相關(guān)的root logger的屬性,這個(gè)root logger就是默認(rèn)的logger日志。

修改后的如下:

File:logger.conf
 
[formatters]
keys=default, data
 
[formatter_default]
format=%(asctime)s - %(name)s - %(levelname)s - %(message)s
class=logging.Formatter
 
[formatter_data]
format=%(asctime)s|%(message)s
class=logging.Formatter
 
[handlers]
keys=console, error_file, data_file
 
[handler_console]
class=logging.StreamHandler
formatter=default
args=tuple()
 
[handler_error_file]
class=logging.FileHandler
level=INFO
formatter=default
args=("logger.log", "a")
 
[handler_data_file]
class=logging.FileHandler
level=INFO
formatter=data
args=("data_new.log", "a")
 
[loggers]
keys=root, data
 
[logger_root]
level=DEBUG
handlers=console,error_file
 
[logger_data]
level=DEBUG
handlers=data_file
qualname=data
propagate=0
File:logger.py
 
#!/bin/env python
 
import logging
from logging.config import logging
 
class Test(object):
 """docstring for Test"""
 def __init__(self):
 self.logger = logging.getLogger(__name__)
 
 def test_func(self):
 self.logger.error('test_func function')
 
class Worker(object):
 """docstring for Worker"""
 def __init__(self):
 logging.config.fileConfig("logger.conf")
 self.logger = logging.getLogger(__name__)
 self.data_logger = logging.getLogger('data')
 
 def test_logger(self):
 self.data_logger.error("test_logger function")
 instance = Test()
 self.data_logger.error("test_logger output")
 instance.test_func()
 
 
def main():
 worker = Worker()
 worker.test_logger()
 
if __name__ == '__main__':
 main()

以上這篇解決Python logging模塊無(wú)法正常輸出日志的問(wèn)題就是小編分享給大家的全部?jī)?nèi)容了,希望能給大家一個(gè)參考,也希望大家多多支持腳本之家。

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