scrapy之Logging使用

#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")