pip install tr​​eq失败

Question

根据http://treq.readthedocs.org/en/latest/，可以使用pip安装treq，但是它失败了。我可以使用tar文件安装treq，但我想知道为什么这会失败，因为http://pypi.python.org/simple/treq/有0.1.0和0.2.0。

$ sudo pip install treq
Downloading/unpacking treq
  Cannot fetch index base URL http://pypi.python.org/simple/
  Could not find any downloads that satisfy the requirement treq
No distributions at all found for treq
Storing complete log in <cut>.pip/pip.log
$ pip search treq
megrok.strictrequire      - Checks that all grokked "view-like" components
                            require a permission.
streql                    - Constant-time string comparison
trequests                 - A Tornado async HTTP/HTTPS client adaptor for
                            python-requests
treq                      - A requests-like API built on top of twisted.web's
                            Agent
repoze.bfg.restrequest    - a REST aware Request for implementing RESTful
                            applications with repoze.bfg

$

刚尝试从tarfile安装，它也找不到扭曲，所以想知道是否存在pip的基本问题......

$ sudo python setup.py install
running install
Checking .pth file support in /usr/local/lib/python2.7/dist-packages/
<snip>
Extracting treq-0.2.0-py2.7.egg to /usr/local/lib/python2.7/dist-packages
Adding treq 0.2.0 to easy-install.pth file

Installed /usr/local/lib/python2.7/dist-packages/treq-0.2.0-py2.7.egg
Processing dependencies for treq==0.2.0
Searching for Twisted>=12.1.0
Reading http://pypi.python.org/simple/Twisted/
Download error on http://pypi.python.org/simple/Twisted/: timed out -- Some packages      may not be found!
Reading http://pypi.python.org/simple/Twisted/
Download error on http://pypi.python.org/simple/Twisted/: timed out -- Some packages     may not be found!
Couldn't find index page for 'Twisted' (maybe misspelled?)
Scanning index of all packages (this may take a while)
Reading http://pypi.python.org/simple/
Download error on http://pypi.python.org/simple/: timed out -- Some packages may not be found!
No local packages or download links found for Twisted>=12.1.0
error: Could not find suitable distribution for Requirement.parse('Twisted>=12.1.0')
$

Answer 1

错误消息显示为：

  

Download error on http://pypi.python.org/simple/Twisted/: timed out -- Some packages may not be found!

您是否检查过阻止访问PyPI的防火墙？