title: No module found in my python
body: <p>I tried to read all the issues concerning the python's error
  ImportError: No module named
  I reinstalled all the modules I need using </p>
  
  <pre><code>sudo apt-get install build-essential python-dev python-setuptools python-numpy python-scipy libatlas-dev libatlas3gf-base
  </code></pre>
  
  <p>I also upgraded using pip </p>
  
  <pre><code>sudo pip install --upgrade numpy
  sudo pip install --upgrade scipy
  </code></pre>
  
  <p>When runing <code>pip list</code> I get</p>
  
  <p>matplotlib (1.3.1)</p>
  
  <p>scipy (0.17.0)</p>
  
  <p>numpy (1.11.0)</p>
  
  <p>But here is the execution result : </p>
  
  <pre><code>&gt;&gt;&gt; import matplotlib
  Traceback (most recent call last):
    File "&lt;stdin&gt;", line 1, in &lt;module&gt;
  ImportError: No module named matplotlib
  
   &gt;&gt;&gt; import numpy
  Traceback (most recent call last):
    File "&lt;stdin&gt;", line 1, in &lt;module&gt;
    File "/usr/lib/python2.7/dist-packages/numpy/__init__.py", line 153, in &lt;module&gt;
      from . import add_newdocs
    File "/usr/lib/python2.7/dist-packages/numpy/add_newdocs.py", line 13, in &lt;module&gt;
      from numpy.lib import add_newdoc
    File "/usr/lib/python2.7/dist-packages/numpy/lib/__init__.py", line 8, in &lt;module&gt;
      from .type_check import *
    File "/usr/lib/python2.7/dist-packages/numpy/lib/type_check.py", line 11, in &lt;module&gt;
      import numpy.core.numeric as _nx
    File "/usr/lib/python2.7/dist-packages/numpy/core/__init__.py", line 6, in &lt;module&gt;
      from . import multiarray
  ImportError: /usr/lib/python2.7/dist-packages/numpy/core/multiarray.so: undefined symbol: PyUnicodeUCS4_AsUnicodeEscapeString
  </code></pre>
  
  <p>I don't know what's happening! please help!!</p>
  
  <p>OS ubuntu14.04</p>
  
  <p>NEW EDIT
  So some news: I checked out the install of python and I found different versions in different places. In the python2.7 case I have : </p>
  
  <pre><code>/usr/bin/python2.7
  /usr/local/bin/pyton2.7
  </code></pre>
  
  <p>While using <code>which</code> I get </p>
  
  <pre><code>which python
  /usr/local/bin/python
  </code></pre>
  
  <p>But the <code>/usr/bin/python2.7</code> works really fine</p>
  
  <pre><code>cd /usr/bin
  ./python2.7
  Python 2.7.6 (default, Jun 22 2015, 17:58:13) 
  [GCC 4.8.2] on linux2
  Type "help", "copyright", "credits" or "license" for more information.
  &gt;&gt;&gt; import scipy
  &gt;&gt;&gt; import numpy
  &gt;&gt;&gt; import matplotlib
  &gt;&gt;&gt; 
  </code></pre>
  
  <p>Thanks</p>