码迷,mamicode.com
首页 > 其他好文 > 详细

logging的使用

时间:2020-02-28 12:01:44      阅读:100      评论:0      收藏:0      [点我收藏+]

标签:说明   read   date   for   pre   erro   code   输出   sim   

A simple example
  • the default log of level is WARNING
    1
    2
    3
    import logging
    logging.warning('Watch out!')
    logging.info('I told you so') # will not print anything
1
WARNING:root:Watch out!
Logging to a file

主要说明如何将日志打印到文件中,以及如何刷新日志(不保留原有的日志).

1
2
3
4
5
6
7
8
import logging
# set filename and log level
logging.basicConfig(filename='example.log',level=logging.DEBUG)
# If you want each run to start afresh, not remembering the messages from earlier runs, you can specify the filemode argument,
# logging.basicConfig(filename='example.log', filemode='w', level=logging.DEBUG)
logging.debug('This message should go to the log file')
logging.info('So should this')
logging.warning('And this, too')
Logging variable data

主要说明日志输出是可以使用变量的

1
2
import logging
logging.warning('%s before you %s', 'Look', 'leap!')
Changing the format of displayed messages

主要说明如何改变日志输出格式以及是时间输出格式如何改变

1
2
3
4
5
6
7
8
9
10
import logging
# you can use 'format=' to formulate what you want output
logging.basicConfig(format='%(levelname)s:%(message)s', level=logging.DEBUG)
logging.debug('This message should appear on the console')
logging.info('So should this')
logging.warning('And this, too')

# detefmt can formulate format of date
logging.basicConfig(format='%(asctime)s %(message)s', datefmt='%m/%d/%Y %I:%M:%S %p')
logging.warning('is when this event was logged.')
Configuring Logging

主要说明日志如何新建日志的实例对象以及如何配置日志文件

建立日志对象
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
import logging

# create logger
logger = logging.getLogger('simple_example')
logger.setLevel(logging.DEBUG)

# create console handler and set level to debug
ch = logging.StreamHandler()
ch.setLevel(logging.DEBUG)

# create formatter
formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')

# add formatter to ch
ch.setFormatter(formatter)

# add ch to logger
logger.addHandler(ch)

# 'application' code
logger.debug('debug message')
logger.info('info message')
logger.warn('warn message')
logger.error('error message')
logger.critical('critical message')
建立日志对象并且读取日志配置文件
1
2
大专栏  logging的使用ass="line">3
4
5
6
7
8
9
10
11
12
13
14
import logging
import logging.config

logging.config.fileConfig('logging.conf')

# create logger
logger = logging.getLogger('simpleExample')

# 'application' code
logger.debug('debug message')
logger.info('info message')
logger.warn('warn message')
logger.error('error message')
logger.critical('critical message')

logging.conf

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
[loggers]
keys=root,simpleExample

[handlers]
keys=consoleHandler

[formatters]
keys=simpleFormatter

[logger_root]
level=DEBUG
handlers=consoleHandler

[logger_simpleExample]
level=DEBUG
handlers=consoleHandler
qualname=simpleExample
propagate=0

[handler_consoleHandler]
class=StreamHandler
level=DEBUG
formatter=simpleFormatter
args=(sys.stdout,)

[formatter_simpleFormatter]
format=%(asctime)s - %(name)s - %(levelname)s - %(message)s
datefmt=

another logging.conf

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
[loggers]
keys=root,simple

[handlers]
keys=consoleHandler,fileHandler,rotatingFileHandler

[formatters]
keys=simpleFmt

[logger_root]
level=DEBUG
handlers=consoleHandler
# handlers=fileHandler
# handlers=rotatingFileHandler

[logger_simple]
level=DEBUG
handlers=consoleHandler,fileHandler
qualname=simple
propagate=0

[handler_consoleHandler]
class=StreamHandler
level=DEBUG
formatter=simpleFmt
args=(sys.stdout,)

[handler_fileHandler]
class=FileHandler
level=DEBUG
formatter=simpleFmt
args=('test.log', 'w')

[handler_rotatingFileHandler]
class=handlers.RotatingFileHandler
level=DEBUG
formatter=simpleFmt
args=("python.log", "a", 20*1024*1024, 10)

[formatter_simpleFmt]
format=%(asctime)s - %(name)s - %(levelname)s - %(message)s - [%(filename)s:%(lineno)s]
datefmt=
Level Numeric value
CRITICAL 50
ERROR 40
WARNING 30
INFO 20
DEBUG 10
NOTSET 0
Format Description
%(levelno)s 打印日志级别的数值
%(levelname)s 打印日志级别名称
%(pathname)s 打印当前执行程序的路径,其实就是sys.argv[0]
%(filename)s 打印当前执行程序名
%(funcName)s 打印日志的当前函数
%(lineno)d 打印日志的当前行号
%(asctime)s 打印日志的时间
%(thread)d 打印线程ID
%(threadName)s 打印线程名称
%(process)d 打印进程ID
%(message)s 打印日志信息

logging的使用

标签:说明   read   date   for   pre   erro   code   输出   sim   

原文地址:https://www.cnblogs.com/lijianming180/p/12376392.html

(0)
(0)
   
举报
评论 一句话评论(0
登录后才能评论!
© 2014 mamicode.com 版权所有  联系我们:gaon5@hotmail.com
迷上了代码!