def parse(self, response):
try:
sel = Selector(response)
# not sure if this needs editing
movies = sel.xpath('//table[@class="left rt_table"]/tbody/tr')
# make sure we have a list of movies
if not movies:
self.log("Unable to find list of movies in {:s}.".format(response.request.url), level=log.ERROR)
items = []
for movie in movies:
# Ignore the header row, which is the first row returned
if (movie.xpath('th')):
continue
# Gather information about the movie
loader = ItemLoader(MovieItem(), response = response, selector = movie)
# Generate the href for the details page
details_href = 'http://' + response.url.split('/')[2] + str(movie.xpath('td[3]/a/@href').extract()[0])
loader.add_xpath('category', '//form[@action="/top/bestofrt/"]/p/select/option[@selected="selected"]/text()')
loader.add_xpath('rank', 'td[1]/text()', re = r'\d+') # ignore the '.'
loader.add_xpath('rating_tomatoes', 'td[2]/span/span[2]/text()', re = r'\d+')
loader.add_xpath('title', 'td[3]/a/text()', re = r'.*(?= \([0-9]{4}\))')
loader.add_xpath('review_count', 'td[4]/text()')
loader.add_xpath('year', 'td[3]/a/text()', re = r'\d{4}(?=\)$)')
yield loader.load_item()
# yield Request(url=details_href, callback=self.parse_movie_details)
except Exception as e:
# Log the exception then reraise it.
log("Could not parse URL '{:s}'".format(response.request.url), level=log.ERROR)
def parse_movie_details(self, response, loader):
# Process further details here
yield loader.load_item()
* Scrapy提供5层logging级别
scrapy.log.CRITICAL 严重错误的Log级别
scrapy.log.ERROR 错误的Log级别 Log level for errors
scrapy.log.WARNING 警告的Log级别 Log level for warnings
scrapy.log.INFO 记录信息的Log级别(生产部署时推荐的Log级别)
scrapy.log.DEBUG 调试信息的Log级别(开发时推荐的Log级别)
* 使用
from scrapy import log
log.msg("This is a warning", level=log.WARNING)
* 在spider中添加log的推荐方式是使用Spider的 log() 方法
* 该方法会自动在调用 scrapy.log.msg() 时赋值 spider 参数,其他的参数则直接传递给 msg() 方法
* '以上都是被标识为过时(废弃)的了... ...'
----------------------------
loging |
----------------------------
import logging
logging.warning("This is a warning")
logging.debug()
logging.log(logging.WARNING, "This is a warning")
* 在scrapy中使用
self.logger.warning('警告信息')
def process_response(self, request, response, spider):
log('Response received from request url %s ' % (request.url))
def process_request(self, request, spider):
log('Requesting url %s with ' % (request.url))
