Python 如何修复错误&x201C；…中的预期版本规范”；在Windows上使用pip安装？

在Windows 7计算机上，我使用以下命令从本地目录安装程序包：

pip install addons/pnc_tests --upgrade --extra-index-url=http://some_server/simple

这将导致以下错误：

C:\Users\alex\PNC\tas\ENV\Scripts\pip-script.py run on 07/16/14 07:50:47

Exception:
Traceback (most recent call last):
  File "C:\Users\alex\PNC\tas\ENV\lib\site-packages\pip\basecommand.py", line 122, in main
    status = self.run(options, args)
  File "C:\Users\alex\PNC\tas\ENV\lib\site-packages\pip\commands\install.py", line 258, in run
    InstallRequirement.from_line(name, None))
  File "C:\Users\alex\PNC\tas\ENV\lib\site-packages\pip\req.py", line 173, in from_line
    return cls(req, comes_from, url=url, prereleases=prereleases)
  File "C:\Users\alex\PNC\tas\ENV\lib\site-packages\pip\req.py", line 71, in __init__
    req = pkg_resources.Requirement.parse(req)
  File "C:\Users\alex\PNC\tas\ENV\lib\site-packages\pip\_vendor\pkg_resources.py", line 2667, in parse
    reqs = list(parse_requirements(s))
  File "C:\Users\alex\PNC\tas\ENV\lib\site-packages\pip\_vendor\pkg_resources.py", line 2605, in parse_requirements
    line, p, specs = scan_list(VERSION,LINE_END,line,p,(1,2),"version spec")
  File "C:\Users\alex\PNC\tas\ENV\lib\site-packages\pip\_vendor\pkg_resources.py", line 2573, in scan_list
    raise ValueError("Expected "+item_name+" in",line,"at",line[p:])
ValueError: ('Expected version spec in', 'addons/pnc_tests', 'at', '/pnc_tests')

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如何解决此问题？

需要将斜杠（

/

）替换为反斜杠（

\

）：

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我猜您缺少参数

-r

它必须是这样的，如果你有一个需求文件来安装

pip安装-r插件/pnc_测试--升级--额外索引url=http://some_server/simple

如上所定义；

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在我的系统上，我刚刚指定了错误的目录。仔细检查你的文件夹名。x_x

更新pip对我有效：

pip安装-U pip

pip install addons\pnc_tests --upgrade --extra-index-url=http://some_server/simple