Traceback (most recent call last):
  File "/usr/bin/ipython", line 5, in <module>
    from IPython import start_ipython
  File "/usr/local/lib/python2.7/dist-packages/IPython/__init__.py", line 48, in <module>
    from .core.application import Application
  File "/usr/local/lib/python2.7/dist-packages/IPython/core/application.py", line 24, in <module>
    from IPython.core import release, crashhandler
  File "/usr/local/lib/python2.7/dist-packages/IPython/core/crashhandler.py", line 28, in <module>
    from IPython.core import ultratb
  File "/usr/local/lib/python2.7/dist-packages/IPython/core/ultratb.py", line 121, in <module>
    from IPython.utils.terminal import get_terminal_size
  File "/usr/local/lib/python2.7/dist-packages/IPython/utils/terminal.py", line 27, in <module>
    import backports.shutil_get_terminal_size
ImportError: No module named backports.shutil_get_terminal_size