无法通过 pip 安装任何包

Question

出于某种原因，我在使用 pip 安装新软件包时遇到了问题。我有一个 OS Sierra 环境，之前一切正常。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）。

我有最新的点子：

  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。

知道有什么问题吗？

已编辑

我将 pip 安装执行为：

 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

原文由 user1919 发布，翻译遵循 CC BY-SA 4.0 许可协议

Answer 1

感谢@Klaus D. 评论（建议添加：命令中的 -v 标志），我发现 URL 为：

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

需要改为

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

执行此命令效果很好：

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

或者，您可以按照 此处 的答案之一所述更改 pip.conf 文件：

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

原文由 user1919 发布，翻译遵循 CC BY-SA 3.0 许可协议

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，因为默认的 pip 版本 8 无法识别正确的 url

我用了：

 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

原文由 doubando 发布，翻译遵循 CC BY-SA 4.0 许可协议