Add support for PyQt4 and PyQt5 by using Qt.py shim

[sdrave]

No description provided.

[sdrave]

@pymor/pymor-devs, could you check if the gui stuff is still working for you with this PR?

[ftalbrecht]

Executing the following:

virtualenv --system-site-packages -p python3 venv
. venv/bin/activate
git clone https://github.com/pymor/pymor.git
cd pymor
git checkout qt_py
pip install -r requirements.txt
pip install -r requirements-optional.txt
cd src
echo $PWD > "$(python -c 'from distutils.sysconfig import get_python_lib; print(get_python_lib())')/pymor.pth"
python setup.py build_ext --inplace
cd pymordemos
./thermalblock_gui.py

gives the following error:

Traceback (most recent call last):
  File "./thermalblock_gui.py", line 46, in <module>
    from Qt import QtWidgets
ModuleNotFoundError: No module named 'Qt'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "./thermalblock_gui.py", line 48, in <module>
    raise QtMissing()
pymor.core.exceptions.QtMissing: cannot visualize: import of Qt bindings failed

I am obviously missing something...

[renefritze]

Works fine for me.

[ftalbrecht]

I get the same error without --system-site-packages. pip freeze gives

alabaster==0.7.10
appdirs==1.4.3
Babel==2.4.0
coverage==4.4
cycler==0.10.0
Cython==0.25.2
decorator==4.0.11
docopt==0.6.2
docutils==0.13.1
evtk==1.0.1
imagesize==0.7.1
ipykernel==4.6.1
ipyparallel==6.0.2
ipython==6.0.0
ipython-genutils==0.2.0
jedi==0.10.2
Jinja2==2.9.6
jupyter-client==5.0.1
jupyter-core==4.3.0
MarkupSafe==1.0
matplotlib==2.0.1
mpi4py==2.0.0
numpy==1.12.1
olefile==0.44
packaging==16.8
pexpect==4.2.1
pickleshare==0.7.4
Pillow==4.1.1
prompt-toolkit==1.0.14
ptyprocess==0.5.1
py==1.4.33
pyamg==3.2.1
Pygments==2.2.0
PyOpenGL==3.1.0
pyparsing==2.2.0
pytest==3.0.7
pytest-cov==2.4.0
pytest-runner==2.11.1
python-dateutil==2.6.0
pytz==2017.2
pyzmq==16.0.2
requests==2.13.0
scipy==0.19.0
simplegeneric==0.8.1
six==1.10.0
snowballstemmer==1.2.1
Sphinx==1.5.5
tornado==4.5.1
traitlets==4.3.2
wcwidth==0.1.7

[ftalbrecht]

Following @sdrave suggestions,

virtualenv -p python3.6 venv
. venv/bin/activate
pip install git+https://github.com/pymor/pymor@qt_py
git clone https://github.com/pymor/pymor.git
cd pymor/src/pymordemos
git checkout qt_py
./thermalblock_gui.py

yields

Traceback (most recent call last):
  File "./thermalblock_gui.py", line 40, in <module>
    import OpenGL
ModuleNotFoundError: No module named 'OpenGL'

pip freeze gives

alabaster==0.7.10
appdirs==1.4.3
Babel==2.4.0
Cython==0.25.2
docopt==0.6.2
docutils==0.13.1
imagesize==0.7.1
Jinja2==2.9.6
MarkupSafe==1.0
numpy==1.12.1
packaging==16.8
Pygments==2.2.0
pymor==0.5.0rc0+479.gd7f10a82
pyparsing==2.2.0
pytz==2017.2
Qt.py==1.0.0b3
requests==2.13.0
scipy==0.19.0
six==1.10.0
snowballstemmer==1.2.1
Sphinx==1.5.5

[sdrave]

Works on @ftalbrecht's machine as well ..