Hi,

I'm running Debian testing and have installed Spyder3 from unstable (as there 
is currently no testing version of spyder3). When trying to run it, I got this 
error:
$ spyder3 
Traceback (most recent call last):
  File "/usr/bin/spyder3", line 3, in <module>
    start.main()
  File "/usr/lib/python3/dist-packages/spyder/app/start.py", line 103, in main
    from spyder.app import mainwindow
  File "/usr/lib/python3/dist-packages/spyder/app/mainwindow.py", line 49, in 
<module>
    requirements.check_qt()
  File "/usr/lib/python3/dist-packages/spyder/requirements.py", line 41, in 
check_qt
    actual_ver = qtpy.PYQT_VERSION
AttributeError: module 'qtpy' has no attribute 'PYQT_VERSION'

It turns out that, although qtpy does not have PYQT_VERSION, it does have 
__version__ which seems to return the pyqt version. Changing the line above to 
actual_ver = qtpy.__version__ makes it work. I don't know if this is a quirk of 
installing the unstable version in testing or just a bug from the switch from 
qt4 to qt5, but I thought you may want to know.

Regards,
Keziah Milligan
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