#coding:utf-8

__author__ = 'similarface'

######################

##Logging的使用

######################

import logging

'''

1. logging.CRITICAL - for critical errors (highest severity) 致命错误

2. logging.ERROR - for regular errors 一般错误

3. logging.WARNING - for warning messages 警告＋错误

4. logging.INFO - for informational messages 消息＋警告＋错误

5. logging.DEBUG - for debugging messages (lowest severity) 低级别

'''

logging.warning("This is a warning")

logging.log(logging.WARNING,"This is a warning")

#获取实例对象

logger=logging.getLogger()

logger.warning("这是警告消息")

#指定消息发出者

logger = logging.getLogger('SimilarFace')

logger.warning("This is a warning")

#在爬虫中使用log

import scrapy

class MySpider(scrapy.Spider):

    name = 'myspider'

    start_urls = ['http://scrapinghub.com']

    def parse(self, response):

        #方法1 自带的logger

        self.logger.info('Parse function called on %s', response.url)

        #方法2 自己定义个logger

        logger.info('Parse function called on %s', response.url)

'''

Logging 设置

• LOG_FILE

• LOG_ENABLED

• LOG_ENCODING

• LOG_LEVEL

• LOG_FORMAT

• LOG_DATEFORMAT • LOG_STDOUT

命令行中使用

--logfile FILE

Overrides LOG_FILE

--loglevel/-L LEVEL

Overrides LOG_LEVEL

--nolog

Sets LOG_ENABLED to False

'''

import logging

from scrapy.utils.log import configure_logging

configure_logging(install_root_handler=False)

#定义了logging的些属性

logging.basicConfig(

    filename='/Users/similarface/PycharmProjects/FluentPython/log.txt',

    format='%(levelname)s: %(levelname)s: %(message)s',

    level=logging.INFO

)

#运行时追加模式

logging.info('进入Log文件')

logger = logging.getLogger('SimilarFace')

logger.warning("也要进入Log文件")