如何在 Windows 上使用 pip install 修复错误“Expected version spec in ..."? [英] How to fix error “Expected version spec in …” using pip install on Windows?

问题描述

在 Windows 7 机器上，我使用以下命令从本地目录安装包:

On a Windows 7 machine I am using the following command to install a package from a local directory:

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

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')

如何解决这个问题?

推荐答案

需要用反斜杠 (\) 替换斜杠 (/):

One need to replace the slash (/) by a backslash (\):

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

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