logging

py

基本用法

import logging
import sys
# 获取logger实例，如果参数为空则返回root logger
logger = logging.getLogger("AppName")
# 指定logger输出格式
formatter = logging.Formatter('%(asctime)s %(levelname)-8s: %(message)s')
# 文件日志
file_handler = logging.FileHandler("test.log")
file_handler.setFormatter(formatter)  # 可以通过setFormatter指定输出格式
# 控制台日志
console_handler = logging.StreamHandler(sys.stdout)
console_handler.formatter = formatter  # 也可以直接给formatter赋值
# 为logger添加的日志处理器
logger.addHandler(file_handler)
logger.addHandler(console_handler)
# 指定日志的最低输出级别，默认为WARN级别
logger.setLevel(logging.INFO)
# 输出不同级别的log
logger.debug('this is debug info')
logger.info('this is information')
logger.warn('this is warning message')
logger.error('this is error message')
logger.fatal('this is fatal message, it is same as logger.critical')
logger.critical('this is critical message')
# 2016-10-08 21:59:19,493 INFO    : this is information
# 2016-10-08 21:59:19,493 WARNING : this is warning message
# 2016-10-08 21:59:19,493 ERROR   : this is error message
# 2016-10-08 21:59:19,493 CRITICAL: this is fatal message, it is same as logger.critical
# 2016-10-08 21:59:19,493 CRITICAL: this is critical message
# 异常捕获
try:
    1 / 0
except:
    # 等同于error级别，但是会额外记录当前抛出的异常堆栈信息
    logger.exception('this is an exception message')
# 2016-10-08 21:59:19,493 ERROR   : this is an exception message
# Traceback (most recent call last):
#   File "D:/Git/py_labs/demo/use_logging.py", line 45, in 
#     1 / 0
# ZeroDivisionError: integer division or modulo by zero

组成

Logger

输出日志的对象，为单例

logger = logging.getLogger('name') #  获得实例
logger.setLevel(logging.INFO)#指定最低的日志级别
logger.addFilter()
logger.removeFilter()
logger.addHandler()
logger.removeHandler()
logger.debug()
logger.info()
logger.warning()
logger.error()
logger.critical()
logger.log('debug', 'This is a bug') #  数直接输出内容并选择对应的告警级别

Handlers

对log进行分发

handler = logging.FileHandler("test.log")
handler.setLevel()
handler.setFormatter()
handler.addFilter()
handler.removeFilter()

Formatters

输出格式

formatter = logging.Formatter('%(asctime)s %(levelname)-8s: %(message)s')

Filter

在handler之上提供粒度判断

配置

logging.basicConfig(level=logging.INFO,
         format='%(asctime)s %(filename)s[line:%(lineno)d] %(levelname)s %(message)s',
         datefmt='[%Y-%m_%d %H:%M:%S]',
         filename='../log/my.log',
         filemode='a')

logging.config.fileConfig(log_conf_file)

##############################################
[loggers]
keys=root, log02
[logger_root]
level=INFO
handlers=handler01
[logger_log02]
level=DEBUG
handler=handler02
qualname=log02
##############################################
[handlers]
keys=handler01,handler02
[handler_handler01]
class=FileHandler
level=INFO
formatter=form01
args=('../log/cv_parser_gm_server.log',"a")
[handler_handler02]
class=StreamHandler
level=NOTSET
formatter=form01
args=(sys.stdout,)
##############################################
[formatters]
keys=form01,form02
[formatter_form01]
format=%(asctime)s %(filename)s[line:%(lineno)d] %(levelname)s %(process)d %(message)s
datefmt=[%Y-%m-%d %H:%M:%S]
[formatter_form02]
format=(message)s
##############################################

多进程解决

解决方案

参考

Python中的logging模块