Examples of python writing logs to files and consoles through logging

The following is an example of python writing logs to files and consoles through logging. It has a good reference value and I hope it will be helpful to everyone. Let’s take a look together

As shown below:

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')

Regarding the configuration of formatter, %( The form of )s is the keyword replacement of the dictionary. Keywords provided include:

##FormatDescriptionName of the logger (logging channel).Numeric logging level for the message (Text logging level for the message (##%(funcName)s%(lineno)d%(created)f##%(relativeCreated)d%(asctime)s 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).Thread ID (if available).%(threadName)sThread name (if available).Process ID (if available).The logged message, computed as Python implementation of log log Sample code

%(name)s
%(levelno)s	DEBUG, INFO, WARNING, ERROR, CRITICAL).
%(levelname)s	'DEBUG', 'INFO', 'WARNING', 'ERROR' , 'CRITICAL').
##%(pathname)s Full pathname of the source file where the logging call was issued (if available).
%(filename)sFilename portion of pathname.
%(module)s##Module ( name portion of filename).
Name of function containing the logging call.
Source line number where the logging call was issued (if available).
Time when the LogRecord	was created ( as returned by time.time()).
Time in milliseconds when the LogRecord was created, relative to the time the logging module was loaded.
Human-readable time when the LogRecord	##%(msecs)d
Millisecond portion of the time when the LogRecord was created.	##%(thread)d
##%(process)d
%(message)s
msg % args	.Related recommendations:

A brief discussion on the configuration file path problem of python log

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