Comment 4 for bug 1324391

I've been able to recreate this via the following steps:

schroot -u root -c trusty-amd64
apt-get install python-pip debsums
pip install httpie
pip --help
(ImportError traceback)
------------------------------------------------
Here's the output:

(trusty-amd64)root@impulse:/home/bdmurray# pip install httpie
Downloading/unpacking httpie
  Downloading httpie-0.9.2-py2.py3-none-any.whl (66kB): 66kB downloaded
Downloading/unpacking requests>=2.3.0 (from httpie)
  Downloading requests-2.7.0-py2.py3-none-any.whl (470kB): 470kB downloaded
Downloading/unpacking Pygments>=1.5 (from httpie)
  Downloading Pygments-2.0.2-py2-none-any.whl (672kB): 672kB downloaded
Installing collected packages: httpie, requests, Pygments
  Found existing installation: requests 2.2.1
    Uninstalling requests:
      Successfully uninstalled requests
Successfully installed httpie requests Pygments
Cleaning up...
(trusty-amd64)root@impulse:/home/bdmurray# pip --help
Traceback (most recent call last):
  File "/usr/bin/pip", line 9, in <module>
    load_entry_point('pip==1.5.4', 'console_scripts', 'pip')()
  File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 351, in load_entry_point
    return get_distribution(dist).load_entry_point(group, name)
  File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 2363, in load_entry_point
    return ep.load()
  File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 2088, in load
    entry = __import__(self.module_name, globals(),globals(), ['__name__'])
  File "/usr/lib/python2.7/dist-packages/pip/__init__.py", line 11, 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
(trusty-amd64)root@impulse:/home/bdmurray# debsums python-requests
debsums: missing file /usr/lib/python2.7/dist-packages/requests-2.2.1.egg-info (from python-requests package)
/usr/lib/python2.7/dist-packages/requests/__init__.py OK