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我正在尝试在 Ubuntu 12.04 上使用 devstack 安装 openstack。这是我得到的错误：

+ set +o xtrace
+ sudo PIP_DOWNLOAD_CACHE=/var/cache/pip HTTP_PROXY= HTTPS_PROXY= NO_PROXY= /usr/local/bin/pip install --build=/tmp/pip-build.9BPNh 'prettytable>0.7'
Downloading/unpacking prettytable>0.7
  Cannot fetch index base URL https://pypi.python.org/simple/
  Could not find any downloads that satisfy the requirement prettytable>0.7
Cleaning up...
No distributions at all found for prettytable>0.7
Storing complete log in /home/vagrant/.pip/pip.log

这是日志：

vagrant@precise32:~/devstack$ cat /home/vagrant/.pip/pip.log 
------------------------------------------------------------
/usr/local/bin/pip run on Fri Apr 11 12:02:37 2014
Downloading/unpacking prettytable>0.7

  Getting page https://pypi.python.org/simple/prettytable/
  Could not fetch URL https://pypi.python.org/simple/prettytable/: <urlopen error [Errno 111] Connection refused>
  Will skip URL https://pypi.python.org/simple/prettytable/ when looking for download links for prettytable>0.7
  Getting page https://pypi.python.org/simple/
  Could not fetch URL https://pypi.python.org/simple/: <urlopen error [Errno 111] Connection refused>
  Will skip URL https://pypi.python.org/simple/ when looking for download links for prettytable>0.7
  Cannot fetch index base URL https://pypi.python.org/simple/

  URLs to search for versions for prettytable>0.7:
  * https://pypi.python.org/simple/prettytable/
  Getting page https://pypi.python.org/simple/prettytable/
  Could not fetch URL https://pypi.python.org/simple/prettytable/: <urlopen error [Errno 111] Connection refused>
  Will skip URL https://pypi.python.org/simple/prettytable/ when looking for download links for prettytable>0.7
  Could not find any downloads that satisfy the requirement prettytable>0.7

Cleaning up...

No distributions at all found for prettytable>0.7

Exception information:
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/pip-1.4.1-py2.7.egg/pip/basecommand.py", line 134, in main
    status = self.run(options, args)
  File "/usr/local/lib/python2.7/dist-packages/pip-1.4.1-py2.7.egg/pip/commands/install.py", line 236, in run
    requirement_set.prepare_files(finder, force_root_egg_info=self.bundle, bundle=self.bundle)
  File "/usr/local/lib/python2.7/dist-packages/pip-1.4.1-py2.7.egg/pip/req.py", line 1085, in prepare_files
    url = finder.find_requirement(req_to_install, upgrade=self.upgrade)
  File "/usr/local/lib/python2.7/dist-packages/pip-1.4.1-py2.7.egg/pip/index.py", line 265, in find_requirement
    raise DistributionNotFound('No distributions at all found for %s' % req)
DistributionNotFound: No distributions at all found for prettytable>0.7

我不确定，为什么会出现此错误，请您帮我解决一下。

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