logging的使用方法

1,简单使用方法

>>> import logging

>>> logging.warning('this is a warning')

WARNING:root:this is a warning

2,通用的记录日志的方法,可加入日志的级别

>>> import logging

>>> logging.log(logging.WARNING,"this is a warning")

WARNING:root:this is a warning

3,通过logger记录日志

>>> import logging

>>> logger = logging.getLogger(__name__)

>>> logger.warning("this is a warning")

WARNING:__main__:this is a warning

在scrapy中的使用

情景一:

import scrapy

class MySpider(scrapy.Spider):

    name = 'myspider'

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

    def parse(self, response):

        # 在scrapy.Spider中默认就有logger,所以下面直接引用

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

情景二:

import logging

import scrapy

#在这里设置logger的名称

logger = logging.getLogger('mycustomlogger')

class MySpider(scrapy.Spider):

    name = 'myspider'

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

    def parse(self, response):

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

logging级别

logging.CRITICAL - for critical errors (highest severity)

logging.ERROR - for regular errors

logging.WARNING - for warning messages

logging.INFO - for informational messages

logging.DEBUG - for debugging messages (lowest severity)