title: How to import python3 lib in python3.6
body: <p>I have virtual environment created for python 3.6. And I have install <code>python3-pyqt5.qtwebkit</code> package with <code>apt-get</code>. The package have installed in global python3.5 and its working, but if I try to import it from venv python3.6 there is import error... How can I install this package in my virtual environment? Or if this is not possible how can I use global package installed in 3.5 in my virtualenv 3.6 python.</p>
  
  <h1>Running with global python3.5</h1>
  
  <pre><code>(virtualenv) 
  ~/vcs-ss/sst  master ✗                                                                                                                         5d ▴ ⚑ ✚ ◒  
  ▶ python3.5 -c 'import PyQt5.QtWebKit; print(PyQt5.QtWebKit.__file__)'
  /usr/lib/python3/dist-packages/PyQt5/QtWebKit.cpython-35m-x86_64-linux-gnu.so
  </code></pre>
  
  <h1>Running with python3.6 from venv</h1>
  
  <pre><code>(virtualenv) 
  ~/vcs-ss/sst  master ✗                                                                                                                         5d ▴ ⚑ ✚ ◒  
  ▶ python3.6 test/e2e/browser.py     
  Traceback (most recent call last):
    File "test/e2e/browser.py", line 8, in &lt;module&gt;
      from PyQt5.QtWebKit import *
  ModuleNotFoundError: No module named 'PyQt5.QtWebKit'
  Error in sys.excepthook:
  Traceback (most recent call last):
    File "/usr/lib/python3/dist-packages/apport_python_hook.py", line 63, in apport_excepthook
      from apport.fileutils import likely_packaged, get_recent_crashes
    File "/usr/lib/python3/dist-packages/apport/__init__.py", line 5, in &lt;module&gt;
      from apport.report import Report
    File "/usr/lib/python3/dist-packages/apport/report.py", line 30, in &lt;module&gt;
      import apport.fileutils
    File "/usr/lib/python3/dist-packages/apport/fileutils.py", line 23, in &lt;module&gt;
      from apport.packaging_impl import impl as packaging
    File "/usr/lib/python3/dist-packages/apport/packaging_impl.py", line 23, in &lt;module&gt;
      import apt
    File "/usr/lib/python3/dist-packages/apt/__init__.py", line 23, in &lt;module&gt;
      import apt_pkg
  ModuleNotFoundError: No module named 'apt_pkg'
  
  Original exception was:
  Traceback (most recent call last):
    File "test/e2e/browser.py", line 8, in &lt;module&gt;
      from PyQt5.QtWebKit import *
  ModuleNotFoundError: No module named 'PyQt5.QtWebKit'
  </code></pre>