Matplotlib clash qt4 / qt5

[DoudouBall]

Hello everybody, I am seeking help for my python installation. I recently reinstalled Anaconda to use Python 3 and matplotlib doesn't work anymore. Even for the simplest code:

import matplotlib.pyplot as pyplot
pyplot.plot([1, 2, 3, 4, 5, 6],[4, 5, 1, 3, 6, 7])
pyplot.show()

I receive this error message:
"ImportError: Cannot load backend 'Qt4Agg' which requires the 'qt4' interactive framework, as 'qt5' is currently running" when pyplot.plot is called


Does any of you know where is the problem from. I never used QT before (didn't even know matplotlib used it) and I can't debug my code fast enough because of this mistake.

Thank you for reading guys!

[DoudouBall]

After some investigation, it seems that the issue is due to Spyder (no problem to run on Conda) Don't know why Spyder forces Matplotlib on qt4 though...