title: ImportError: No module named sip (python2.7 PyQt4)
body: <p>I'm currently using Ubuntu 18.04 LTS.</p>
  
  <p>I'm trying to install a program that need PyQt4 and QtWebKit, so a manual installation is necessary as QtWebKit have been excluded from PyQt4.</p>
  
  <p>I downloaded sip 4.19.12 (with 4.19.14 installation of PyQt4 fails) and  PyQt4 4.12.13</p>
  
  <p>I ran a virtualenv, made sure it was working as intended and tried installing sip, which works:</p>
  
  <pre><code>$ python configure.py
  $ make
  $ make install
  </code></pre>
  
  <p>Then I proceed with the same with PyQt4, with no errors.</p>
  
  <p>When I try to run my program .py, it gives the following error:</p>
  
  <pre><code>$ python RNAEditor.py
  Traceback (most recent call last):
  File "RNAEditor.py", line 9, in &lt;module&gt;
  from Helper import Helper, Parameters
  File "/home/bioinfo/Documentos/Ferramentas_RNAEditor/RNAEDITOR_ch/Helper.py", line 13, in &lt;module&gt;
  from PyQt4 import QtCore
  ImportError: No module named sip
  
  $ sudo python RNAEditor.py 
  Traceback (most recent call last):
  File "RNAEditor.py", line 9, in &lt;module&gt;
  from Helper import Helper, Parameters
  File "/home/bioinfo/Documentos/Ferramentas_RNAEditor/RNAEDITOR_ch/Helper.py", line 13, in &lt;module&gt;
  from PyQt4 import QtCore
  ImportError: No module named PyQt4
  </code></pre>
  
  <p>I'm sure that my virtual env does have sip and PyQt4, as importing both within virtualenv/python gives no error too.</p>
  
  <pre><code>$ python
  &gt;&gt;&gt; import PyQt4
  &gt;&gt;&gt; import sip
  &gt;&gt;&gt; from PyQt4 import QtCore
  Traceback (most recent call last):
  File "&lt;stdin&gt;", line 1, in &lt;module&gt;
  ImportError: No module named sip
  </code></pre>
  
  <p>Any ideas on how to set PyQt4 and sip with a manual installation, or why it is not working as intended?</p>