python日志demo

原始方式

# 最原始的方式
#!/usr/local/bin/python
# -*- coding: utf-8 -*-

import logging

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

# Set default log level
logger.setLevel(logging.DEBUG)


ch = logging.StreamHandler()
ch.setLevel(logging.WARN)

ch2 = logging.FileHandler('logging.log')
ch2.setLevel(logging.INFO)

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

# add formatter to ch
ch.setFormatter(formatter)
ch2.setFormatter(formatter)

# add ch to logger
# The final log level is the higher one between the default and the one in handler
logger.addHandler(ch)
logger.addHandler(ch2)

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

通过dict进行配置

# 通过dict配置
#!/usr/local/bin/python
# -*- coding: utf-8 -*-

import logging
import logging.config

config = {
    'version': 1,
    'formatters': {
        'simple': {
            'format': '%(asctime)s - %(name)s - %(levelname)s - %(message)s',
        },
    },
    'handlers': {
        'console': {
            'class': 'logging.StreamHandler',
            'level': 'DEBUG',
            'formatter': 'simple'
        },
        'file': {
             # 如果没有使用并发的日志处理类而使用原始类logging.FileHandler，在多实例的情况下日志会出现缺失
            'class': 'cloghandler.ConcurrentRotatingFileHandler',
            'filename': 'logging.log',
            'level': 'DEBUG',
            'formatter': 'simple'
            # 当达到10MB时分割日志
            'maxBytes': 1024 * 1024 * 10,
            # 最多保留50份文件
            'backupCount': 50,
            # If delay is true,
            # then file opening is deferred until the first call to emit().
            'delay': True,
            'filename': 'logs/mysite.log',
        },
    },
    'loggers':{
        'root': {
            'handlers': ['console'],
            'level': 'DEBUG',
            # 'propagate': True,
        },
        'simple': {
            'handlers': ['console', 'file'],
            'level': 'WARN',
        }
    }
}

logging.config.dictConfig(config)


print 'logger:'
logger = logging.getLogger('root')

logger.debug('debug message')
logger.info('info message')
logger.warn('warn message')
logger.error('error message')
logger.critical('critical message')


print 'logger2:'
logger2 = logging.getLogger('simple')

logger2.debug('debug message')
logger2.info('info message')
logger2.warn('warn message')
logger2.error('error message')
logger2.critical('critical message')

通过ini文件配置

# 通过ini配置
#!/usr/local/bin/python
# -*- coding: utf-8 -*-

import logging
import logging.config

logging.config.fileConfig('logging_config.ini')

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

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

# logging_config.ini
[loggers]
keys=root,simpleExample

[handlers]
keys=consoleHandler

[formatters]
keys=simpleFormatter

[logger_root]
level=DEBUG
handlers=consoleHandler

[logger_simpleExample]
level=INFO
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