ubuntu下pip出错的临时解决办法

今天pip忽然出问题了：

Traceback (most recent call last):
File "/usr/bin/pip", line 9, in <module>
load_entry_point('pip==1.5.6', 'console_scripts', 'pip')()
File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 356, in load_entry_point
return get_distribution(dist).load_entry_point(group, name)
File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 2476, in load_entry_point
return ep.load()
File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 2190, in load
['name'])
File "/usr/lib/python2.7/dist-packages/pip/init.py", line 61, in <module>
from pip.vcs import git, mercurial, subversion, bazaar # noqa
File "/usr/lib/python2.7/dist-packages/pip/vcs/mercurial.py", line 9, in <module>
from pip.download import path_to_url
File "/usr/lib/python2.7/dist-packages/pip/download.py", line 25, in <module>
from requests.compat import IncompleteRead
ImportError: cannot import name IncompleteRead

看缘由应该是request库的问题，去launchpad一查，果真不止我一个：https://bugs.launchpad.net/ubuntu/+source/python-pip/+bug/1306991。缘由貌似是个人request库太新致使的。。。Orz

临时解决办法：手动备份删除/usr/lib/python2.7/dist-packages/下的requests和request-x.x.x.dist-info两个文件夹。