Question

我是Python和Scrapy的新手，我正在学习Scrapy教程。我已经能够使用DOS界面创建我的项目并输入：

scrapy startproject dmoz

本教程稍后会引用Crawl命令：

scrapy crawl dmoz.org

但是每次我尝试运行时，我都会收到一条消息，告知这不是一个合法的命令。进一步展望它看起来我需要进入一个项目，这是我无法弄清楚的。我已经尝试将目录更改为我在startproject中创建的“dmoz”文件夹，但根本不识别Scrapy。

我确信我错过了一些明显的东西，我希望有人可以指出它。

Answer 1

您必须在'startproject'文件夹中执行它。如果找到scrapy.cfg文件，您将有另一个命令。你可以在这里看到差异：

$ scrapy startproject bar
$ cd bar/
$ ls
bar  scrapy.cfg
$ scrapy
Scrapy 0.12.0.2536 - project: bar

Usage:
  scrapy <command> [options] [args]

Available commands:
  crawl         Start crawling from a spider or URL
  deploy        Deploy project in Scrapyd target
  fetch         Fetch a URL using the Scrapy downloader
  genspider     Generate new spider using pre-defined templates
  list          List available spiders
  parse         Parse URL (using its spider) and print the results
  queue         Deprecated command. See Scrapyd documentation.
  runserver     Deprecated command. Use 'server' command instead
  runspider     Run a self-contained spider (without creating a project)
  server        Start Scrapyd server for this project
  settings      Get settings values
  shell         Interactive scraping console
  startproject  Create new project
  version       Print Scrapy version
  view          Open URL in browser, as seen by Scrapy

Use "scrapy <command> -h" to see more info about a command


$ cd ..
$ scrapy
Scrapy 0.12.0.2536 - no active project

Usage:
  scrapy <command> [options] [args]

Available commands:
  fetch         Fetch a URL using the Scrapy downloader
  runspider     Run a self-contained spider (without creating a project)
  settings      Get settings values
  shell         Interactive scraping console
  startproject  Create new project
  version       Print Scrapy version
  view          Open URL in browser, as seen by Scrapy

Use "scrapy <command> -h" to see more info about a command

Answer 2

未设置PATH环境变量。

您可以通过查找“系统属性”（我的电脑＆gt;属性＆gt;高级系统设置）导航到“高级”选项卡并单击“环境变量”按钮，为Python和Scrapy设置PATH环境变量。在新窗口中，滚动到“系统变量”窗口中的“变量路径”，然后添加以分号分隔的以下行

C:\{path to python folder}
C:\{path to python folder}\Scripts

例如

C:\Python27;C:\Python27\Scripts

试图让Scrapy成为一个运行Crawl命令的项目

2 个答案: