python - 针对本地文件的 Scrapy shell

Question

在 Scrapy 1.0 之前，我可以非常简单地针对本地文件运行 Scrapy Shell:

$ scrapy shell index.html

升级到1.0.3后开始报错:

$ scrapy shell index.html
2015-10-12 15:32:59 [scrapy] INFO: Scrapy 1.0.3 started (bot: scrapybot)
2015-10-12 15:32:59 [scrapy] INFO: Optional features available: ssl, http11, boto
2015-10-12 15:32:59 [scrapy] INFO: Overridden settings: {'LOGSTATS_INTERVAL': 0}
Traceback (most recent call last):
  File "/Users/user/.virtualenvs/so/bin/scrapy", line 11, in <module>
    sys.exit(execute())
  File "/Users/user/.virtualenvs/so/lib/python2.7/site-packages/scrapy/cmdline.py", line 143, in execute
    _run_print_help(parser, _run_command, cmd, args, opts)
  File "/Users/user/.virtualenvs/so/lib/python2.7/site-packages/scrapy/cmdline.py", line 89, in _run_print_help
    func(*a, **kw)
  File "/Users/user/.virtualenvs/so/lib/python2.7/site-packages/scrapy/cmdline.py", line 150, in _run_command
    cmd.run(args, opts)
  File "/Users/user/.virtualenvs/so/lib/python2.7/site-packages/scrapy/commands/shell.py", line 50, in run
    spidercls = spidercls_for_request(spider_loader, Request(url),
  File "/Users/user/.virtualenvs/so/lib/python2.7/site-packages/scrapy/http/request/__init__.py", line 24, in __init__
    self._set_url(url)
  File "/Users/user/.virtualenvs/so/lib/python2.7/site-packages/scrapy/http/request/__init__.py", line 59, in _set_url
    raise ValueError('Missing scheme in request url: %s' % self._url)
ValueError: Missing scheme in request url: index.html 

这种行为是故意的还是 Scrapy Shell 中的错误？

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作为解决方法，我可以在"file"URL 方案中使用文件的绝对路径:

$ scrapy shell file:////absolute/path/to/index.html

这显然不太方便和容易。

Answer 1

更新:对于 Scrapy >=1.1，这是内置功能，您可以:

scrapy shell file:///path/to/file.html

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旧答案:

根据 Running scrapy shell against a local file 中的讨论, 相关变化由 this commit 介绍.有一个 Pull Request针对这个问题创建了让 Scrapy shell 再次打开本地文件，并且计划成为 Scrapy 1.1 的一部分。