导入错误：没有名为“蜘蛛”的模块

在命令行上，我执行以下简单尝试来调用 scrapy：

scrapy version

我收到以下错误：

$ scrapy version
Traceback (most recent call last):
  File "/Users/nathanielford/virtualenvironments/crawler/bin/scrapy", line 11, in <module>
    sys.exit(execute())
  File "/Users/nathanielford/virtualenvironments/crawler/lib/python3.5/site-packages/scrapy/cmdline.py", line 141, in execute
    cmd.crawler_process = CrawlerProcess(settings)
  File "/Users/nathanielford/virtualenvironments/crawler/lib/python3.5/site-packages/scrapy/crawler.py", line 238, in __init__
    super(CrawlerProcess, self).__init__(settings)
  File "/Users/nathanielford/virtualenvironments/crawler/lib/python3.5/site-packages/scrapy/crawler.py", line 129, in __init__
    self.spider_loader = _get_spider_loader(settings)
  File "/Users/nathanielford/virtualenvironments/crawler/lib/python3.5/site-packages/scrapy/crawler.py", line 325, in _get_spider_loader
    return loader_cls.from_settings(settings.frozencopy())
  File "/Users/nathanielford/virtualenvironments/crawler/lib/python3.5/site-packages/scrapy/spiderloader.py", line 33, in from_settings
    return cls(settings)
  File "/Users/nathanielford/virtualenvironments/crawler/lib/python3.5/site-packages/scrapy/spiderloader.py", line 20, in __init__
    self._load_all_spiders()
  File "/Users/nathanielford/virtualenvironments/crawler/lib/python3.5/site-packages/scrapy/spiderloader.py", line 28, in _load_all_spiders
    for module in walk_modules(name):
  File "/Users/nathanielford/virtualenvironments/crawler/lib/python3.5/site-packages/scrapy/utils/misc.py", line 63, in walk_modules
    mod = import_module(path)
  File "/Users/nathanielford/virtualenvironments/crawler/lib/python3.5/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 986, in _gcd_import
  File "<frozen importlib._bootstrap>", line 969, in _find_and_load
  File "<frozen importlib._bootstrap>", line 956, in _find_and_load_unlocked
ImportError: No module named 'spiders'

如果我离开项目目录，则不再出现错误：

$ scrapy version
Scrapy 1.2.2

是什么原因造成的ImportError: No module named 'spiders'?

这个错误是由我造成的settings.py文件，其中我有以下内容：

SPIDER_MODULES = ['spiders']

虽然它位于由提供的默认项目中scrapy，我已经移动了该模块。该列表中的值需要是完全限定的模块名称：甚至是简单的执行scrapy将加载设置文件，从而尝试从您的项目导入模块。如果它可以找到设置文件，则该文件必须是正确的。