title: RuntimeError: the sip module implements API v11.0 to v11.2 but the PyQt5.QtCore module requires API v11.3
body: <p>I recently installed PyQt4 onto my system and started doing some basic tasks (course work), it worked fine. </p>
  
  <p>Then, after some days, I was trying to work with <code>matplotlib</code>.</p>
  
  <p>When I tried <code>import matplotlib.pyplot as plt</code>,I get the following error:</p>
  
  <pre><code>Traceback (most recent call last):
    File "C:\Users\user\Desktop\Confusion.py", line 1, in &lt;module&gt;
      import matplotlib.pyplot as plt
    File "C:\Program Files\Anaconda3\lib\site-packages\matplotlib\pyplot.py", line 114, in &lt;module&gt;
      _backend_mod, new_figure_manager, draw_if_interactive, _show = pylab_setup()
    File "C:\Program Files\Anaconda3\lib\site-packages\matplotlib\backends\__init__.py", line 32, in pylab_setup
      globals(),locals(),[backend_name],0)
    File "C:\Program Files\Anaconda3\lib\site-packages\matplotlib\backends\backend_qt5agg.py", line 16, in &lt;module&gt;
      from .backend_qt5 import QtCore
    File "C:\Program Files\Anaconda3\lib\site-packages\matplotlib\backends\backend_qt5.py", line 27, in &lt;module&gt;
      import matplotlib.backends.qt_editor.figureoptions as figureoptions
    File "C:\Program Files\Anaconda3\lib\site-packages\matplotlib\backends\qt_editor\figureoptions.py", line 17, in &lt;module&gt;
      import matplotlib.backends.qt_editor.formlayout as formlayout
    File "C:\Program Files\Anaconda3\lib\site-packages\matplotlib\backends\qt_editor\formlayout.py", line 58, in &lt;module&gt;
      from matplotlib.backends.qt_compat import QtGui, QtWidgets, QtCore
    File "C:\Program Files\Anaconda3\lib\site-packages\matplotlib\backends\qt_compat.py", line 127, in &lt;module&gt;
      from PyQt5 import QtCore, QtGui, QtWidgets
  RuntimeError: the sip module implements API v11.0 to v11.2 but the PyQt5.QtCore module requires API v11.3
  [Finished in 1.9s]
  </code></pre>
  
  <p>I thought that the problem is with the installation of <code>PyQt4</code> while I already had <code>PyQt5</code>, but <a href="http://pyqt.sourceforge.net/Docs/PyQt5/installation.html" rel="noreferrer">this</a>website says that they can work properly together without any problem, provided the <code>sip</code> is of same version for both.</p>
  
  <p>The problem seems to be coming from <code>sip</code>. </p>
  
  <p>I followed the steps given here : <a href="https://stackoverflow.com/a/22896854/3564318">PyQt5 - SIP API 10 level error. API 11 required</a></p>
  
  <ol>
  <li><p>When I run <code>import sip</code> and then
  <code>print(sip, sip.SIP_VERSION_STR)</code></p>
  
  <p>I get the following:
  
  4.16.9</p></li>
  <li><p>Then when I run <code>sip -V</code> in the command prompt, I get <code>4.18</code>.</p></li>
  </ol>
  
  <p>I clearly see that there is in the <code>sip</code> module. </p>
  
  <p>All I want to ask is, how do I solve this problem? </p>
  
  <p><strong>I am on a Windows 8 64 bit system, using Anaconda3</strong></p>
  
  <p>Any help is appreciated. :)</p>