scrapy教程:无法运行scrapy crawl dmoz

Question

我问了一个新的问题，因为我意识到我在上一个问题中不够清楚。我正在尝试学习scrapy教程，但我被困在了关键的一步，"scrapy crawl dmoz“命令。代码如下(我已经在python shell中编写了该命令，并将其保存为输入.py扩展名)：

ActivePython 2.7.2.5 (ActiveState Software Inc.) based on
Python 2.7.2 (default, Jun 24 2011, 12:20:15) 
[GCC 4.2.1 (Apple Inc. build 5664)] on darwin
Type "copyright", "credits" or "license()" for more information.
>>> from scrapy.spider import BaseSpider

class dmoz(BaseSpider):
    name = "dmoz"
    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]
        open(filename, 'wb').write(response.body)

>>> 

我使用的目录应该没问题，请在树下找到：

.
├── scrapy.cfg
└── tutorial
    ├── __init__.py
    ├── __init__.pyc
    ├── items.py
    ├── pipelines.py
    ├── settings.py
    ├── settings.pyc
    └── spiders
        ├── __init__.py
        ├── __init__.pyc
        └── dmoz_spider.py

2 directories, 10 files

现在，当我尝试运行"scapy crawl dmoz“时，我得到的结果是：

$ scrapy crawl dmoz

2013-08-14 12:51:40+0200 [scrapy] INFO: Scrapy 0.16.5 started (bot: tutorial)
2013-08-14 12:51:40+0200 [scrapy] DEBUG: Enabled extensions: LogStats, TelnetConsole, CloseSpider, WebService, CoreStats, SpiderState
Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/2.7/bin/scrapy", line 5, in <module>
    pkg_resources.run_script('Scrapy==0.16.5', 'scrapy')
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pkg_resources.py", line 499, in run_script
    self.require(requires)[0].run_script(script_name, ns)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pkg_resources.py", line 1235, in run_script
    execfile(script_filename, namespace, namespace)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/Scrapy-0.16.5-py2.7.egg/EGG-INFO/scripts/scrapy", line 4, in <module>
    execute()
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/Scrapy-0.16.5-py2.7.egg/scrapy/cmdline.py", line 131, in execute
    _run_print_help(parser, _run_command, cmd, args, opts)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/Scrapy-0.16.5-py2.7.egg/scrapy/cmdline.py", line 76, in _run_print_help
    func(*a, **kw)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/Scrapy-0.16.5-py2.7.egg/scrapy/cmdline.py", line 138, in _run_command
    cmd.run(args, opts)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/Scrapy-0.16.5-py2.7.egg/scrapy/commands/crawl.py", line 43, in run
    spider = self.crawler.spiders.create(spname, **opts.spargs)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/Scrapy-0.16.5-py2.7.egg/scrapy/command.py", line 33, in crawler
    self._crawler.configure()
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/Scrapy-0.16.5-py2.7.egg/scrapy/crawler.py", line 40, in configure
    self.spiders = spman_cls.from_crawler(self)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/Scrapy-0.16.5-py2.7.egg/scrapy/spidermanager.py", line 35, in from_crawler
    sm = cls.from_settings(crawler.settings)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/Scrapy-0.16.5-py2.7.egg/scrapy/spidermanager.py", line 31, in from_settings
    return cls(settings.getlist('SPIDER_MODULES'))
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/Scrapy-0.16.5-py2.7.egg/scrapy/spidermanager.py", line 22, in __init__
    for module in walk_modules(name):
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/Scrapy-0.16.5-py2.7.egg/scrapy/utils/misc.py", line 65, in walk_modules
    submod = __import__(fullpath, {}, {}, [''])
  File "/Users//Documents/tutorial/tutorial/spiders/dmoz_spider.py", line 1
    ActivePython 2.7.2.5 (ActiveState Software Inc.) based on
                   ^
SyntaxError: invalid syntax

有人知道我做的这些步骤出了什么问题吗？谢谢你的帮助。这是我的第一次编程经验，所以这可能是一个非常愚蠢的问题。

Answer 1

这不是缩进问题，错误消息很清楚：

File "/Users//Documents/tutorial/tutorial/spiders/dmoz_spider.py", line 1
ActivePython 2.7.2.5 (ActiveState Software Inc.) based on
               ^
SyntaxError: invalid syntax

很明显，您已经复制粘贴了IDLE中的代码，包括IDLE中的起始字符串，这不是代码。

试着打开一个编辑器，在那里实际输入教程代码，而不是复制粘贴，你会学得更好，而且你不会无意中粘贴垃圾。

Answer 2

缩进不正确。它应该是：

>>>from scrapy.spider import BaseSpider

>>>class dmoz(BaseSpider):
       name = "dmoz"
       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]
          open(filename, 'wb').write(response.body)

我认为你在空闲时复制粘贴的代码，请缩进类。