logging模块

模块图

代码

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
import logging
# 【简单日志】
# logging.basicConfig(filename='log1.txt',level=logging.DEBUG)
# logging.warning('错误')

# 【logger handler format】
logger=logging.getLogger('abc')
logger.setLevel(logging.DEBUG)
fh=logging.FileHandler(filename='filehandler.log.txt',mode='a',encoding='utf-8')
fh.setLevel(logging.WARNING)
formatter=logging.Formatter('%(message)s')
fh.setFormatter(formatter)
logger.addHandler(fh)
logger.debug('debug')
logger.info('info')
logger.warning('warning')
logger.error('error')
logger.critical('critical')
logger.critical('中文')

或者加入到两个handler处理

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
import logging
# 【简单日志】
# logging.basicConfig(filename='log1.txt',level=logging.DEBUG)
# logging.warning('错误')

# 【logger handler format】
logger=logging.getLogger('abc')
logger.setLevel(logging.DEBUG)
fh=logging.FileHandler(filename='filehandler.log.txt',mode='a',encoding='utf-8')
sh=logging.StreamHandler()
fh.setLevel(logging.WARNING)
formatter=logging.Formatter('%(message)s')
fh.setFormatter(formatter)
logger.addHandler(fh)
logger.addHandler(sh)
logger.debug('debug')
logger.info('info')
logger.warning('warning')
logger.error('error')
logger.critical('critical')
logger.critical('中文')

View Code

yaml配置文件方式（另一种ini配置文件方式可读性差略）

logging.conf.yaml

version: 1
formatters:
  simple:
    format: '%(asctime)s - %(name)s - %(levelname)s - %(message)s'
handlers:
  console:
    class: logging.StreamHandler
    level: DEBUG
    formatter: simple
    stream: ext://sys.stdout
  fh:
    class: logging.FileHandler
    level: DEBUG
    filename: log.txt
    mode: a
    encoding: utf-8

loggers:
  simpleExample:
    level: DEBUG
    handlers: [console,fh]
    propagate: no
root:
  level: DEBUG
  handlers: [console]

py ( pip install pyyaml )

#!/usr/bin/env python3
# _*_ coding:utf-8 _*_
#

import logging
import logging.config  # 注意
import yaml
f=open('logging.conf.yaml')
dic=yaml.load(f)
print(dic)
f.close()

logging.config.dictConfig(dic)
logger = logging.getLogger('simpleExample')
logger.debug('debug message')
logger.info('info message')
logger.warn('warn message')
logger.error('error message')
logger.critical('critical message')
logger.critical('中文')

附：另一个yaml配置文件参考

version: 1
disable_existing_loggers: False
formatters:
    simple:
        format: "%(asctime)s - %(filename)s - %(levelname)s - %(message)s"

handlers:
    console:
        class: logging.StreamHandler
        level: ERROR
        formatter: simple
        stream: ext://sys.stdout

    info_file_handler:
        class: logging.handlers.RotatingFileHandler
        level: INFO
        formatter: simple
        filename: ./mylog/info.log
        maxBytes: 10485760 # 10MB
        backupCount: 20
        encoding: utf8

    error_file_handler:
        class: logging.handlers.RotatingFileHandler
        level: ERROR
        formatter: simple
        filename: errors.log
        maxBytes: 10485760 # 10MB
        backupCount: 20
        encoding: utf8

loggers:
    my_module:
        level: ERROR
        handlers: [console]
        propagate: no

root:
    level: INFO
    handlers: [console, info_file_handler]

View Code

format参数

%(name)s Logger的名字
%(levelno)s 数字形式的日志级别
%(levelname)s 文本形式的日志级别
%(pathname)s 调用日志输出函数的模块的完整路径名，可能没有
%(filename)s 调用日志输出函数的模块的文件名
%(module)s 调用日志输出函数的模块名
%(funcName)s 调用日志输出函数的函数名
%(lineno)d 调用日志输出函数的语句所在的代码行
%(created)f 当前时间，用UNIX标准的表示时间的浮 点数表示
%(relativeCreated)d 输出日志信息时的，自Logger创建以 来的毫秒数
%(asctime)s 字符串形式的当前时间。默认格式是 “2003-07-08 16:49:45,896”。逗号后面的是毫秒
%(thread)d 线程ID。可能没有
%(threadName)s 线程名。可能没有
%(process)d 进程ID。可能没有
%(message)s用户输出的消息

part2 django中的logging

配置（dict方式，内容类似yaml）

LOGGING = {
    'version': 1,
    'disable_existing_loggers': False,
    'formatters': {
        'verbose': {
            'format': '%(levelname)s %(asctime)s %(module)s %(process)d %(thread)d %(message)s'
        },
        'simple': {
            'format': '%(levelname)s %(message)s'
        },
    },
    'filters': {
        'special': {
            '()': 'project.logging.SpecialFilter',
            'foo': 'bar',
        },
        'require_debug_true': {
            '()': 'django.utils.log.RequireDebugTrue',
        },
    },
    'handlers': {
        'console': {
            'level': 'INFO',
            'filters': ['require_debug_true'],
            'class': 'logging.StreamHandler',
            'formatter': 'simple'
        },
        'mail_admins': {
            'level': 'ERROR',
            'class': 'django.utils.log.AdminEmailHandler',
            'filters': ['special']
        }
    },
    'loggers': {
        'django': {
            'handlers': ['console'],
            'propagate': True,
        },
        'django.request': {
            'handlers': ['mail_admins'],
            'level': 'ERROR',
            'propagate': False,
        },
        'myproject.custom': {
            'handlers': ['console', 'mail_admins'],
            'level': 'INFO',
            'filters': ['special']
        }
    }
}

View Code

view中使用

# 导入logging库
import logging

# 获取一个logger对象
logger = logging.getLogger(__name__)

def my_view(request, arg1, arg):
    ...
    if bad_mojo:
        # 记录一个错误日志
        logger.error('Something went wrong!')

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