python - pip install 抛出值错误

Question

我在 Windows 8.1 64 位操作系统上运行 Python(x,y) 2.7.10.0。我以前使用 pip 来安装一些包，但现在当我尝试

pip install nltk
pip install pycallgraph
pip search nltk
pip install selenium

出现以下错误

    C:\Python27\lib\site-packages\xy>pip search nltk
    Traceback (most recent call last):
      File "C:\Python27\Scripts\pip-script.py", line 5, in <module>
        from pkg_resources import load_entry_point
      File "build\bdist.win32\egg\pkg_resources.py", line 2880, in <module>
      File "build\bdist.win32\egg\pkg_resources.py", line 432, in _build_master
      File "build\bdist.win32\egg\pkg_resources.py", line 741, in require
      File "build\bdist.win32\egg\pkg_resources.py", line 586, in resolve
      File "build\bdist.win32\egg\pkg_resources.py", line 2714, in parse_requirements
      File "build\bdist.win32\egg\pkg_resources.py", line 2690, in scan_list
    ValueError: ("Expected ',' or end-of-list in", 'pip==7.0.3+xy.11', 'at', '+xy.11')

Answer 1

我在windows上也有这个问题。无论我尝试用 pip 做什么，我都会收到此错误。解决方案是:

python -m pip install -U pip setuptools

我在安装 pip 说明页面上找到它:https://packaging.python.org/installing/#install-pip-setuptools-and-wheel