Python和Scrapy:Scrapy版本的问题

Question

我正在使用Ubuntu 14.04 x64,我已经按照Scrapy文档使用pip安装包:

pip install scrapy

然后我跟着示例项目的初始化并尝试执行示例spider:

scrapy crawl example

我收到此错误:

2015-02-23 10:23:42+0100 [scrapy] INFO: Scrapy 0.14.4 started (bot: example)
2015-02-23 10:23:42+0100 [scrapy] DEBUG: Enabled extensions: LogStats, TelnetConsole, CloseSpider, WebService, CoreStats, MemoryUsage, SpiderState
Traceback (most recent call last):
  File "/usr/local/bin/scrapy", line 11, in <module>
    sys.exit(execute())
  File "/usr/lib/python2.7/dist-packages/scrapy/cmdline.py", line 132, in execute
    _run_print_help(parser, _run_command, cmd, args, opts)
  File "/usr/lib/python2.7/dist-packages/scrapy/cmdline.py", line 97, in _run_print_help
    func(*a, **kw)
  File "/usr/lib/python2.7/dist-packages/scrapy/cmdline.py", line 139, in _run_command
    cmd.run(args, opts)
  File "/usr/lib/python2.7/dist-packages/scrapy/commands/crawl.py", line 43, in run
    spider = self.crawler.spiders.create(spname, **opts.spargs)
  File "/usr/lib/python2.7/dist-packages/scrapy/command.py", line 34, in crawler
    self._crawler.configure()
  File "/usr/lib/python2.7/dist-packages/scrapy/crawler.py", line 36, in configure
    self.spiders = spman_cls.from_crawler(self)
  File "/usr/lib/python2.7/dist-packages/scrapy/spidermanager.py", line 37, in from_crawler
    return cls.from_settings(crawler.settings)
  File "/usr/lib/python2.7/dist-packages/scrapy/spidermanager.py", line 33, in from_settings
    return cls(settings.getlist('SPIDER_MODULES'))
  File "/usr/lib/python2.7/dist-packages/scrapy/spidermanager.py", line 23, in __init__
    for module in walk_modules(name):
  File "/usr/lib/python2.7/dist-packages/scrapy/utils/misc.py", line 65, in walk_modules
    submod = __import__(fullpath, {}, {}, [''])
  File "/home/alvaro/vagrantenvs/example/example/spiders/example_spider.py", line 3, in <module>
    class ExampleSpider(scrapy.Spider):
AttributeError: 'module' object has no attribute 'Spider'

我检查了pip freeze | grep 'Scrapy'检查已安装的Scrapy版本,我得到了:

Scrapy==0.24.4

但正如您在traceback错误中看到的那样:

2015-02-23 10:23:42+0100 [scrapy] INFO: Scrapy 0.14.4 started (bot: example)

1. 我试图卸载并重新安装
2. 我也尝试更新pip,卸载scrapy并重新安装
3. 我尝试使用apt-get安装它

---

• 为什么如果我安装了最新版本(0.24.4),它似乎正在执行0.14.4？
• 这个问题与Scrapy,Pip或两者有关吗？

编辑:

这是文件example_spider.py:

import scrapy

class ExampleSpider(scrapy.Spider):
    name = "example"
    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):
        filename = response.url.split("/")[-2]
        with open(filename, 'wb') as f:
            f.write(response.body)

如果我执行scrapy version@aberna sugested我得到:

Scrapy 0.14.4

Answer 1

当时我遇到了类似的问题,这是因为Ubuntu软件包正在搞乱pip包.

当我使用pip安装Scrapy 并尝试运行它时,scrapy说该软件包缺少一些依赖项,然后我安装了Scrapy使用,apt-get并且在那里我搞砸了软件包版本.

我建议你从Ubuntu和Pip中删除这两个软件包,然后只使用pip重新安装:

apt-get remove --purge python-scrapy
pip uninstall scrapy

完成这些操作后,您可以使用pip再次安装它,然后如果您这样做,scrapy version您应该获得最新版本的响应,在您的情况下它应该是0.24.4.

编辑

您可以在Scrapy文档中阅读:

python-scrapy是官方debian存储库提供的一个不同的包,它已经过时了,Scrapy团队不支持它.

要在Ubuntu中安装Scrapy,他们会说:

1. 将用于签署Scrapy包的GPG密钥导入APT密钥环:

   sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 627220E7

2. 使用以下命令创建/etc/apt/sources.list.d/scrapy.list文件:

   回声'的deb http://archive.scrapy.org/ubuntu scrapy主' | sudo tee /etc/apt/sources.list.d/scrapy.list

3.更新软件包列表并安装scrapy-0.24软件包:

sudo apt-get update && sudo apt-get install scrapy-0.24

检查这里:Ubuntu上的Scrapy