Applications relying on Python3 Qt bindings will fail. The qtpy module tries to
import the __version__ object from the PySide module, while this module has no
such property. The __version__ property existed in the Python2 version of
PySide, but was deprecated in its Python3 version.

The affected packages are:
python3-qt4 and/or python3-qt5
python3-pyside
spyder3 and any programs requiring the Python3 Qt bindings

Python3 traceback:
Traceback (most recent call last):
  File "/usr/lib/python3.6/site-packages/qtpy/__init__.py", line 119, in
<module>
    from PySide import __version__ as PYSIDE_VERSION  # analysis:ignore
ImportError: cannot import name '__version__'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/bin/spyder3", line 3, in <module>
    start.main()
  File "/usr/lib/python3.6/site-packages/spyder/app/start.py", line 103, in
main
    from spyder.app import mainwindow
  File "/usr/lib/python3.6/site-packages/spyder/app/mainwindow.py", line 49, in
<module>
    requirements.check_qt()
  File "/usr/lib/python3.6/site-packages/spyder/requirements.py", line 39, in
check_qt
    import qtpy
  File "/usr/lib/python3.6/site-packages/qtpy/__init__.py", line 125, in
<module>
    raise PythonQtError('No Qt bindings could be found')
qtpy.PythonQtError: No Qt bindings could be found