我试图从这个网站上抓取一些基本数据，作为了解更多关于scrapy的练习，并作为大学项目的概念证明：http://steamdb.info/sales/
当我使用刮擦外壳时，我能够使用以下XPath获得我想要的信息：
sel.xpath(‘//tbody/tr[1]/td[2]/a/text()’).extract()
它应该返回表格第一行的游戏标题，在结构中：
<tbody>
<tr>
<td></td>
<td><a>stuff I want here</a></td>
...
它确实如此，在外壳中。
但是，当我尝试将其放入蜘蛛（steam.py）时：
1 from scrapy.spider import BaseSpider
2 from scrapy.selector import HtmlXPathSelector
3 from steam_crawler.items import SteamItem
4 from scrapy.selector import Selector
5
6 class SteamSpider(BaseSpider):
7 name = "steam"
8 allowed_domains = ["http://steamdb.info/"]
9 start_urls = ['http://steamdb.info/sales/?displayOnly=all&category=0&cc=uk']
10 def parse(self, response):
11 sel = Selector(response)
12 sites = sel.xpath("//tbody")
13 items = []
14 count = 1
15 for site in sites:
16 item = SteamItem()
17 item ['title'] = sel.xpath('//tr['+ str(count) +']/td[2]/a/text()').extract().encode('utf-8')
18 item ['price'] = sel.xpath('//tr['+ str(count) +']/td[@class=“price-final”]/text()').extract().encode('utf-8')
19 items.append(item)
20 count = count + 1
21 return items
我收到以下错误：
ricks-mbp:steam_crawler someuser$ scrapy crawl steam -o items.csv -t csv
Traceback (most recent call last):
File "/usr/local/bin/scrapy", line 5, in <module>
pkg_resources.run_script('Scrapy==0.20.0', 'scrapy')
File "build/bdist.macosx-10.9-intel/egg/pkg_resources.py", line 492, in run_script
File "build/bdist.macosx-10.9-intel/egg/pkg_resources.py", line 1350, in run_script
for name in eagers:
File "/Library/Python/2.7/site-packages/Scrapy-0.20.0-py2.7.egg/EGG-INFO/scripts/scrapy", line 4, in <module>
execute()
File "/Library/Python/2.7/site-packages/Scrapy-0.20.0-py2.7.egg/scrapy/cmdline.py", line 143, in execute
_run_print_help(parser, _run_command, cmd, args, opts)
File "/Library/Python/2.7/site-packages/Scrapy-0.20.0-py2.7.egg/scrapy/cmdline.py", line 89, in _run_print_help
func(*a, **kw)
File "/Library/Python/2.7/site-packages/Scrapy-0.20.0-py2.7.egg/scrapy/cmdline.py", line 150, in _run_command
cmd.run(args, opts)
File "/Library/Python/2.7/site-packages/Scrapy-0.20.0-py2.7.egg/scrapy/commands/crawl.py", line 47, in run
crawler = self.crawler_process.create_crawler()
File "/Library/Python/2.7/site-packages/Scrapy-0.20.0-py2.7.egg/scrapy/crawler.py", line 87, in create_crawler
self.crawlers[name] = Crawler(self.settings)
File "/Library/Python/2.7/site-packages/Scrapy-0.20.0-py2.7.egg/scrapy/crawler.py", line 25, in __init__
self.spiders = spman_cls.from_crawler(self)
File "/Library/Python/2.7/site-packages/Scrapy-0.20.0-py2.7.egg/scrapy/spidermanager.py", line 35, in from_crawler
sm = cls.from_settings(crawler.settings)
File "/Library/Python/2.7/site-packages/Scrapy-0.20.0-py2.7.egg/scrapy/spidermanager.py", line 31, in from_settings
return cls(settings.getlist('SPIDER_MODULES'))
File "/Library/Python/2.7/site-packages/Scrapy-0.20.0-py2.7.egg/scrapy/spidermanager.py", line 22, in __init__
for module in walk_modules(name):
File "/Library/Python/2.7/site-packages/Scrapy-0.20.0-py2.7.egg/scrapy/utils/misc.py", line 68, in walk_modules
submod = import_module(fullpath)
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/importlib/__init__.py", line 37, in import_module
__import__(name)
File "/xxx/scrape/steam/steam_crawler/spiders/steam.py", line 18
SyntaxError: Non-ASCII character 'xe2' in file /xxx/scrape/steam/steam_crawler/spiders/steam.py on line 18, but no encoding declared; see http://www.python.org/peps/pep-0263.html for details
有一种感觉，我需要做的就是以某种方式告诉 scrapy 字符将遵循 utf-8 而不是 ascii - 因为有 £ 等。但是从我所能收集的信息来看，它应该从页面的头部收集这些信息，在这个网站的情况下是：
<meta charset="utf-8">
这让我感到困惑！任何不是刮擦文档本身的见解/阅读，我也会感兴趣！
似乎您使用的是“而不是双引号"
顺便说一句，在所有表行上循环的更好做法是：
for tr in sel.xpath("//tr"):
item = SteamItem()
item ['title'] = tr.xpath('td[2]/a/text()').extract()
item ['price'] = tr.xpath('td[@class="price-final"]/text()').extract()
yield item