How to fix error “Expected version spec in …” using pip install on Windows?
python, windows
Solution
One need to replace the slash (`/`) by a backslash (`\`):
pip install addons\pnc_tests --upgrade --extra-index-url=http://some_server/simple
Problem
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 ``` which results in the following error: ``` 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') ``` How to solve this problem?