提高ValueError（“预期”+ item_name +“in”，line，“at”，line [p：]）ValueError :('预期版本规格'，'django~ = 1.9.0'，'at'，'〜= 1.9.0' ）

Question

我正在使用Python 3在Windows 7上关注this tutorial。但是我收到此错误：

PS C:\Users\jalal> C:/Python34/python -m pip install django~=1.9.0
Exception:
Traceback (most recent call last):
  File "C:\Python34\lib\site-packages\pip\basecommand.py", line 122, in main
    status = self.run(options, args)
  File "C:\Python34\lib\site-packages\pip\commands\install.py", line 257, in run
    InstallRequirement.from_line(name, None))
  File "C:\Python34\lib\site-packages\pip\req.py", line 172, in from_line
    return cls(req, comes_from, url=url, prereleases=prereleases)
  File "C:\Python34\lib\site-packages\pip\req.py", line 70, in __init__
    req = pkg_resources.Requirement.parse(req)
  File "C:\Python34\lib\site-packages\pip\_vendor\pkg_resources.py", line 2667, in parse
    reqs = list(parse_requirements(s))
  File "C:\Python34\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:\Python34\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', 'django~=1.9.0', 'at', '~=1.9.0')

Storing debug log for failure in C:\Users\jalal\pip\pip.log

PS C:\Users\jalal> pip -v
The term 'pip' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the
g of the name, or if a path was included, verify that the path is correct and try again.
At line:1 char:4
+ pip <<<<  -v
    + CategoryInfo          : ObjectNotFound: (pip:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException

我尝试使用-r标志，如Stackoverflow响应中所述，但是我收到了这个错误。

PS C:\Users\jalal> C:/Python34/python -m pip install -r django~=1.9.0
Could not open requirements file: [Errno 2] No such file or directory: 'django~=1.9.0'
Storing debug log for failure in C:\Users\jalal\pip\pip.log

这个问题的解决方案是什么？

更多信息：

pip 1.5.6 from C:\Users\jalal\myvenv\lib\site-packages (python 3.4)
(myvenv) PS C:\Users\jalal> pip freeze
(myvenv) PS C:\Users\jalal>

pip freeze没有显示任何内容。

这是我没有-r标志的原因：

PS C:\Users\jalal> C:/Python34/python -m pip install django~=1.9.0
Exception:
Traceback (most recent call last):
  File "C:\Python34\lib\site-packages\pip\basecommand.py", line 122, in main
    status = self.run(options, args)
  File "C:\Python34\lib\site-packages\pip\commands\install.py", line 257, in run
    InstallRequirement.from_line(name, None))
  File "C:\Python34\lib\site-packages\pip\req.py", line 172, in from_line
    return cls(req, comes_from, url=url, prereleases=prereleases)
  File "C:\Python34\lib\site-packages\pip\req.py", line 70, in __init__
    req = pkg_resources.Requirement.parse(req)
  File "C:\Python34\lib\site-packages\pip\_vendor\pkg_resources.py", line 2667, in parse
    reqs = list(parse_requirements(s))
  File "C:\Python34\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:\Python34\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', 'django~=1.9.0', 'at', '~=1.9.0')

Storing debug log for failure in C:\Users\jalal\pip\pip.log

我也尝试安装pip然后使用以下命令但仍然出错：

PS C:\Users\jalal> myvenv\Scripts\activate
(myvenv) PS C:\Users\jalal> pip install django~=1.9.0
Exception:
Traceback (most recent call last):
  File "C:\Users\jalal\myvenv\lib\site-packages\pip\basecommand.py", line 122, in main
    status = self.run(options, args)
  File "C:\Users\jalal\myvenv\lib\site-packages\pip\commands\install.py", line 257, in run
    InstallRequirement.from_line(name, None))
  File "C:\Users\jalal\myvenv\lib\site-packages\pip\req.py", line 172, in from_line
    return cls(req, comes_from, url=url, prereleases=prereleases)
  File "C:\Users\jalal\myvenv\lib\site-packages\pip\req.py", line 70, in __init__
    req = pkg_resources.Requirement.parse(req)
  File "C:\Users\jalal\myvenv\lib\site-packages\pip\_vendor\pkg_resources.py", line 2667, in parse
    reqs = list(parse_requirements(s))
  File "C:\Users\jalal\myvenv\lib\site-packages\pip\_vendor\pkg_resources.py", line 2605, in parse_requireme
    line, p, specs = scan_list(VERSION,LINE_END,line,p,(1,2),"version spec")
  File "C:\Users\jalal\myvenv\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', 'django~=1.9.0', 'at', '~=1.9.0')

Storing debug log for failure in C:\Users\jalal\pip\pip.log
(myvenv) PS C:\Users\jalal>

Answer 1

pip的版本（1.5.6）似乎无法识别兼容版本说明符~=。

您可以尝试以下与~=1.9.0相同的版本规范：

pip install django>=1.9.0

或者：

pip install django==1.9.*

在任何情况下，您可能还希望使用以下内容升级到pip的最新版本

pip install --upgrade pip

Answer 2

除非您正在阅读文件，否则请取消-r。使用：

C:/Python34/python -m pip install django~=1.9.0