title: Cannot import tensorflow in IPyhon3
body: <p>I am just pasting the output of my bash shell which could be quite explicit. Running IPython:</p>
  
  <pre><code>petrux@orion:~/Projects/dket$ ipython
  Python 3.5.2 (default, Nov 17 2016, 17:05:23) 
  Type 'copyright', 'credits' or 'license' for more information
  IPython 6.0.0 -- An enhanced Interactive Python. Type '?' for help.
  
  In [1]: import tensorflow as tf
  ---------------------------------------------------------------------------
  ImportError                               Traceback (most recent call last)
  &lt;ipython-input-1-41389fad42b5&gt; in &lt;module&gt;()
  ----&gt; 1 import tensorflow as tf
  
  /home/petrux/.local/lib/python3.5/site-packages/tensorflow/__init__.py in &lt;module&gt;()
       22 
       23 # pylint: disable=wildcard-import
  ---&gt; 24 from tensorflow.python import *
       25 # pylint: enable=wildcard-import
       26 
  
  /home/petrux/.local/lib/python3.5/site-packages/tensorflow/python/__init__.py in &lt;module&gt;()
       73 
       74 # Protocol buffers
  ---&gt; 75 from tensorflow.core.framework.graph_pb2 import *
       76 from tensorflow.core.framework.node_def_pb2 import *
       77 from tensorflow.core.framework.summary_pb2 import *
  
  /home/petrux/.local/lib/python3.5/site-packages/tensorflow/core/framework/graph_pb2.py in &lt;module&gt;()
        4 import sys
        5 _b=sys.version_info[0]&lt;3 and (lambda x:x) or (lambda x:x.encode('latin1'))
  ----&gt; 6 from google.protobuf import descriptor as _descriptor
        7 from google.protobuf import message as _message
        8 from google.protobuf import reflection as _reflection
  
  ImportError: No module named 'google.protobuf'; 'google' is not a package
  </code></pre>
  
  <p>while running the regular python interpreter:</p>
  
  <pre><code>petrux@orion:~/Projects/dket$ python3
  Python 3.5.2 (default, Nov 17 2016, 17:05:23) 
  [GCC 5.4.0 20160609] on linux
  Type "help", "copyright", "credits" or "license" for more information.
  &gt;&gt;&gt; import tensorflow as tf
  &gt;&gt;&gt; 
  </code></pre>
  
  <p>I am running <code>Ubuntu 16.04</code> as OS.
  Thanks in advance.</p>