24 May'11

Scrapy 0.12 Parsing with python

Based on Scrapy Tutorial (dead link: doc.scrapy.org/intro/tutorial.html)

  1. Install scrapy and dependencies
sudo apt-get install python-lxml
sudo easy_install -U Scrapy
  1. Create project
scrapy startproject dmoz
  1. Create item models
from scrapy.item import Item, Field

class DmozItem(Item):
    title = Field()
    link = Field()
    desc = Field()
  1. Create spiders (in projname/spiders/)
from scrapy.spider import BaseSpider
from scrapy.selector import HtmlXPathSelector
from dmoz.items import DmozItem

class DmozSpider(BaseSpider):
    name = "dmoz.org"
    allowed_domains = ["dmoz.org"]
    start_urls = [
    "http://www.dmoz.org/Computers/Programming/Languages/Python/Books/",
    "http://www.dmoz.org/Computers/Programming/Languages/Python/Resources/"
    ]

    def parse(self, response):
        hxs = HtmlXPathSelector(response)
        sites = hxs.select('//ul/li')
        items = []
        for site in sites:
            item = DmozItem()
            item['title'] = site.select('a/text()').extract()
            item['link'] = site.select('a/@href').extract()
            item['desc'] = site.select('text()').extract()
            items.append(item)
        return items
  1. Run spiders
scrapy crawl dmoz.org
scrapy crawl dmoz.org --set FEED_URI=items.json --set FEED_FORMAT=json
scrapy crawl dmoz.org --set FEED_URI=items.csv --set FEED_FORMAT=csv

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