title: ImportError: No module named 'pip._vendor.distlib.scripts' when I try to install fabric by python pip
body: <p>When I run this command on  CentOS4.9, it happens such error. I try to search it in Google but no found. Looks I am the first person meets such issue.  </p>
  
  <p># pip install fabric</p>
  
  <pre><code>Traceback (most recent call last):
  File "/usr/local/bin/pip", line 8, in &lt;module&gt;
  load_entry_point('pip==7.0.1', 'console_scripts', 'pip')()
  File "/usr/local/lib/python2.7/site-packages/setuptools-0.6c11-   py2.7.egg/pkg_resources.py", line 318, in load_entry_point
  File "/usr/local/lib/python2.7/site-packages/setuptools-0.6c11-py2.7.egg/pkg_resources.py", line 2221, in load_entry_point
  File "/usr/local/lib/python2.7/site-packages/setuptools-0.6c11-py2.7.egg/pkg_resources.py", line 1954, in load
  File "/usr/local/lib/python2.7/site-packages/pip-7.0.1-py2.7.egg/pip/__init__.py", line 15, in &lt;module&gt;
  from pip.vcs import git, mercurial, subversion, bazaar  # noqa
  File "/usr/local/lib/python2.7/site-packages/pip-7.0.1-py2.7.egg/pip/vcs/subversion.py", line 9, in &lt;module&gt;
  from pip.index import Link
  File "/usr/local/lib/python2.7/site-packages/pip-7.0.1-py2.7.egg/pip/index.py", line 30, in &lt;module&gt;
  from pip.wheel import Wheel, wheel_ext
  File "/usr/local/lib/python2.7/site-packages/pip-7.0.1-py2.7.egg/pip/wheel.py", line 34, in &lt;module&gt;
  from pip._vendor.distlib.scripts import ScriptMaker
  File "/usr/local/lib/python2.7/site-packages/pip-7.0.1-py2.7.egg/pip/_vendor/__init__.py", line 92, in load_module
  raise ImportError("No module named '%s'" % (name,))
  ImportError: No module named 'pip._vendor.distlib.scripts'
  </code></pre>
  
  <p>I went to /usr/local/lib/python2.7/site-packages/pip-7.0.1-py2.7.egg/pip/_vendor/distlib. There is scripts.py file.</p>