Python does not find custom PyQt5
Question: As the offical pyqt5-installation in the ubuntu repositories seem to lack
support for QtQuick, I tried to install pyqt5 from source. The installation
itself seems to work correctly, but when running a python script that uses
PyQt5, python complains that it cannot find that PyQt.

After building sip 4.15.5, I downloaded PyQt5.2. It should be compatible to my
version of Qt (output of `qmake --version`):

    
    
    QMake version 3.0
    Using Qt version 5.2.0 in /opt/qt5.1.1/5.2.0/gcc_64/lib
    

I ran

The output of configure.py of pyqt can be found here:
<https://gist.github.com/Mitmischer/8677889> .

The installation output of pyqt can be found here:
<https://gist.github.com/Mitmischer/8677780> .

After `sudo make install`, I can see a folder `PyQt5` in
`/usr/lib/python3.3/site-packages` which is quite nice. However, if I run cat
`PyQt5/__init__.py`, there is no actual code inside:

    
    
    # Copyright (c) 2014 Riverbank Computing Limited <info@riverbankcomputing.com>
    # 
    # This file is part of PyQt5.
    # 
    # This file may be used under the terms of the GNU General Public License
    # version 3.0 as published by the Free Software Foundation and appearing in
    # the file LICENSE included in the packaging of this file.  Please review the
    # following information to ensure the GNU General Public License version 3.0
    # requirements will be met: http://www.gnu.org/copyleft/gpl.html.
    # 
    # If you do not wish to use this file under the terms of the GPL version 3.0
    # then you may purchase a commercial license.  For more information contact
    # info@riverbankcomputing.com.
    # 
    # This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
    # WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 
    

Yep, that's all what is inside that file. I don't know whether it's supposed
to be that way, but it looks strange to me. Furthermore (`ls PyQt5`):

    
    
    __init__.py               QtCore.so      QtGui.so         QtMultimediaWidgets.so  QtPositioning.so   QtQuick.so       Qt.so     QtTest.so     QtX11Extras.so
    _QOpenGLFunctions_2_0.so  QtDBus.so      QtHelp.so        QtNetwork.so            QtPrintSupport.so  QtSensors.so     QtSql.so  QtWebKit.so   QtXmlPatterns.so
    QtBluetooth.so            QtDesigner.so  QtMultimedia.so  QtOpenGL.so             QtQml.so           QtSerialPort.so  QtSvg.so  QtWidgets.so  uic/
    

Doesn't look that pythonic.

As suggested elsewhere, I (hopefully) set my pythonpath appropriately:

    
    
    > echo $PYTHONPATH 
    /usr/lib/python3.3/site-packages/
    

Now, if I start an interactive `python3.3`-session (or a script), PyQt5 cannot
be found:

    
    
    Python 3.3.2+ (default, Oct  9 2013, 14:50:09) 
    [GCC 4.8.1] on linux
    Type "help", "copyright", "credits" or "license" for more information.
    >>> from PyQt5 import *
    Traceback (most recent call last):
      File "<stdin>", line 1, in <module>
    ImportError: No module named 'PyQt5'
    >>>
    

Has anyone else tried to install PyQt5 from source? What can I do to make PyQt
work?


Answer: You probrably messed PYTHONPATH in someway.

I have successfully built, installed and used PyQT using virtual environment.
So here is how to install it using virtualenv. There are tons of tutorals, so
please read about it.

So install `python-virtualenv`, `virtualenvwrapper` (at least that's what they
are called on Debian).

    
    
    mkvirtualenv -p /path/to/python3.3 name 
    workon name
    cd PyQtSource
    configure 
    make 
    make install 
    

To use this enviorment do:

    
    
    workon name
    python 
    

