title: Pip cannot find Package when installed with --user flag
body: <p>Previously I installed pip packages using <code>sudo pip install package</code>, but I switched to <code>pip install --user package</code>.</p>
  
  <p>The problem is that I installed jupyter-themes using the second method, and when I try to run it the following error gets thrown.</p>
  
  <pre><code>Traceback (most recent call last):
    File "/home/aswinmohanme/.local/bin/jt", line 11, in &lt;module&gt;
      sys.exit(main())
    File "/home/aswinmohanme/.local/lib/python3.5/site-packages/jupyterthemes/__init__.py", line 260, in main
      dfonts=args.defaultfonts)
    File "/home/aswinmohanme/.local/lib/python3.5/site-packages/jupyterthemes/__init__.py", line 54, in install_theme
      from jupyterthemes import stylefx
    File "/home/aswinmohanme/.local/lib/python3.5/site-packages/jupyterthemes/stylefx.py", line 7, in &lt;module&gt;
      from IPython.core.display import HTML
    File "/home/aswinmohanme/.local/lib/python3.5/site-packages/IPython/__init__.py", line 54, in &lt;module&gt;
      from .core.application import Application
    File "/home/aswinmohanme/.local/lib/python3.5/site-packages/IPython/core/application.py", line 23, in &lt;module&gt;
      from traitlets.config.application import Application, catch_config_error
    File "/home/aswinmohanme/.local/lib/python3.5/site-packages/traitlets/__init__.py", line 1, in &lt;module&gt;
      from .traitlets import *
    File "/home/aswinmohanme/.local/lib/python3.5/site-packages/traitlets/traitlets.py", line 60, in &lt;module&gt;
      from .utils.importstring import import_item
    File "/home/aswinmohanme/.local/lib/python3.5/site-packages/traitlets/utils/importstring.py", line 8, in &lt;module&gt;
      from ipython_genutils.py3compat import cast_bytes_py2
  ImportError: No module named 'ipython_genutils'
  </code></pre>
  
  <p>This is the output of <code>pip list installed</code></p>
  
  <pre><code>...
  iniparse (0.4)
  ipykernel (4.5.2)
  ipython (5.3.0)
  ipython-genutils (0.2.0)
  ipywidgets (6.0.0)
  isort (4.2.5)
  ...
  </code></pre>
  
  <p>How do I fix this.</p>