无法通过pip安装任何软件包

Question

由于某些原因，我在安装新的pip包时遇到问题。我有一个OS Sierra环境，以前一切都很好。现在，无论我是否使用virtualenv，我都会得到：

Collecting requests
Could not find a version that satisfies the requirement requests (from 
  versions: )
No matching distribution found for requests

这不仅适用于请求库，也适用于所有其他库（例如django等）。）。

我有最新的pip：

 pip --version
 returns: pip 9.0.1 from /Library/Python/2.7/site-packages/pip-9.0.1-py2.7.egg (python 2.7)

我的python版本是：2.7。12

此外，根据这篇文章，我检查了我是否可以卷曲PyPi网站，我确实得到了回复。

知道出什么问题了吗？

编辑

我执行了pip安装，如下所示：

pip install -vvv requests

我得到了错误的详细输出：

Collecting requests
  2 location(s) to search for versions of requests:
  * http://pypi.python.org/simple/requests/
  * http://pypi.wfp.org/simple/requests/
  Getting page http://pypi.python.org/simple/requests/
  Starting new HTTP connection (1): pypi.python.org
  "GET /simple/requests/ HTTP/1.1" 403 16
  Could not fetch URL http://pypi.python.org/simple/requests/: 403 Client 
  Error: SSL is required for url: http://pypi.python.org/simple/requests/ - 
  skipping
  Getting page http://pypi.wfp.org/simple/requests/
  Starting new HTTP connection (1): pypi.wfp.org
  "GET /simple/requests/ HTTP/1.1" 404 None
  Could not fetch URL http://pypi.wfp.org/simple/requests/: 404 Client 
  Error: NOT FOUND for url: http://pypi.wfp.org/simple/requests/ - skipping
  Could not find a version that satisfies the requirement requests (from 
  versions: )
 Cleaning up...
  No matching distribution found for requests
 Exception information:
 Traceback (most recent call last):
 File "/Library/Python/2.7/site-packages/pip-9.0.1-
py2.7.egg/pip/basecommand.py", line 215, in main
  status = self.run(options, args)
 File "/Library/Python/2.7/site-packages/pip-9.0.1-
py2.7.egg/pip/commands/install.py", line 324, in run
requirement_set.prepare_files(finder)
File "/Library/Python/2.7/site-packages/pip-9.0.1-
py2.7.egg/pip/req/req_set.py", line 380, in prepare_files
ignore_dependencies=self.ignore_dependencies))
File "/Library/Python/2.7/site-packages/pip-9.0.1-
py2.7.egg/pip/req/req_set.py", line 554, in _prepare_file
require_hashes
File "/Library/Python/2.7/site-packages/pip-9.0.1-
py2.7.egg/pip/req/req_install.py", line 278, in populate_link
self.link = finder.find_requirement(self, upgrade)
File "/Library/Python/2.7/site-packages/pip-9.0.1-py2.7.egg/pip/index.py", 
line 514, in find_requirement
'No matching distribution found for %s' % req
DistributionNotFound: No matching distribution found for requests

Answer 1

感谢@klausd.comment（建议在命令中添加-v标志），我发现以下URL：

  http://pypi.python.org/simple/requests/ 

需要改成

  https://pypi.python.org/simple/requests/  (with SSL).

执行此命令效果良好：

pip install -v requests -i https://pypi.python.org/simple/

或者，您可以更改pip.conf文件，如以下答案之一所述：

[global]
timeout = 60
index-url = https://pypi.python.org/simple

Answer 2

user1919提出的解决方案帮助我解决了在lxc ubuntu容器上安装tox的问题，因为defualt pip版本8无法识别正确的url

我用过：

pip install -v tox -i https://pypi.python.org/simple/
....
....
....
Successfully installed filelock-3.0.10 pluggy-0.9.0 py-1.8.0 setuptools-40.8.0 toml-0.10.0 tox-3.7.0 virtualenv-16.4.3