title: Unable to import python packages in Ubuntu (ImportError : undefined symbol)
body: <p>I recently installed python on my Ubuntu 14.04. I downloaded tensorflow by <code>pip</code>.
  When I tried to <code>import tensorflow</code> it said <code>ImportError:No module named tensorflow</code>.
  Then I edited <code>PYTHONPATH</code> by adding <code>/usr/local/lib/python2.7/dist-packages</code>. Now when I try to import, it says </p>
  
  <pre><code>Traceback (most recent call last):
    File "&lt;stdin&gt;", line 1, in &lt;module&gt;
    File "/usr/local/lib/python2.7/dist-packages/tensorflow/__init__.py", line 23, in &lt;module&gt;
      from tensorflow.python import *
    File "/usr/local/lib/python2.7/dist-packages/tensorflow/python/__init__.py", line 45, in &lt;module&gt;
      import numpy as np
    File "/usr/local/lib/python2.7/dist-packages/numpy/__init__.py", line 180, in &lt;module&gt;
      from . import add_newdocs
    File "/usr/local/lib/python2.7/dist-packages/numpy/add_newdocs.py", line 13, in &lt;module&gt;
      from numpy.lib import add_newdoc
    File "/usr/local/lib/python2.7/dist-packages/numpy/lib/__init__.py", line 8, in &lt;module&gt;
      from .type_check import *
    File "/usr/local/lib/python2.7/dist-packages/numpy/lib/type_check.py", line 11, in &lt;module&gt;
      import numpy.core.numeric as _nx
    File "/usr/local/lib/python2.7/dist-packages/numpy/core/__init__.py", line 14, in &lt;module&gt;
      from . import multiarray
  ImportError: /usr/local/lib/python2.7/dist-packages/numpy/core/multiarray.so: undefined symbol: PyUnicodeUCS4_AsUnicodeEscapeString
  </code></pre>
  
  <p>I found <a href="https://stackoverflow.com/questions/27383054/python-importerror-usr-local-lib-python2-7-lib-dynload-io-so-undefined-symb">here</a> that 2 versions of python causes the conflict, but that didn't help. Any assistance will be appreciated. Thank you </p>