python 和碎片 : Issue with Scrapy version

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

然后我按照示例项目的初始化，尝试执行example spider:

scrapy crawl example

我得到这个错误:

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' 检查安装的 Scrapy 版本，我得到:

Scrapy==0.24.4

但正如您在回溯错误中看到的那样:

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

1. 我尝试卸载并重新安装
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？
• 此问题是否与 Scrapy、Pip 或两者有关？

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)

如果我按照@aberna 的建议执行scrapy version，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 包与 pip 包混淆了。

当我使用 pip 安装 Scrapy 并尝试运行它时，scrapy 说这个包缺少一些依赖项，然后我安装了 Scrapy使用 apt-get 并且我搞砸了包版本。

我建议您从 Ubuntu 和 Pip 中删除这两个软件包，然后仅使用 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，然后如果您执行 scrapy version，您应该得到最新版本的响应，在您的情况下应该是0.24.4。

编辑

您可以在 Scrapy 文档中阅读:

python-scrapy is a different package provided by official debian repositories, it’s very outdated and it isn’t supported by Scrapy team.

要在 Ubuntu 中安装 Scrapy，他们说:

1. Import the GPG key used to sign Scrapy packages into APT keyring:

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

2. Create /etc/apt/sources.list.d/scrapy.list file using the following command:

   echo 'deb http://archive.scrapy.org/ubuntu scrapy main' | sudo tee /etc/apt/sources.list.d/scrapy.list

3.Update package lists and install the scrapy-0.24 package:

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

Check Here: Scrapy on Ubuntu