How do I fix 'ImportError: cannot import name IncompleteRead'?

When I try to install anything with pip or pip3, I get:

    $ sudo pip3 install python3-tk
    Traceback (most recent call last):
      File "/usr/bin/pip3", line 9, in <module>
        load_entry_point('pip==1.5.6', 'console_scripts', 'pip3')()
      File "/usr/lib/python3/dist-packages/", line 356, in load_entry_point
        return get_distribution(dist).load_entry_point(group, name)
      File "/usr/lib/python3/dist-packages/", line 2476, in load_entry_point
        return ep.load()
      File "/usr/lib/python3/dist-packages/", line 2190, in load
      File "/usr/lib/python3/dist-packages/pip/", line 61, in <module>
        from pip.vcs import git, mercurial, subversion, bazaar  # noqa
      File "/usr/lib/python3/dist-packages/pip/vcs/", line 9, in <module>
        from import path_to_url
      File "/usr/lib/python3/dist-packages/pip/", line 25, in <module>
        from requests.compat import IncompleteRead
    ImportError: cannot import name 'IncompleteRead'

I have a Ubuntu 14.10 system.

How can I fix this problem?

While this previous answer might be the reason, this snipped worked for me as a solution (in Ubuntu 14.04):

First remove the package from the package manager:

    # apt-get remove python-pip

And then install the latest version by side:

    # easy_install pip

(thanks to @Aufziehvogel, @JunchaoGu)