I've tried now and it works correctly. Maybe updating some python packages fixed the problem.

On Fri, Apr 8, 2016 at 8:06 PM Filipe Saraiva via KDE Bugzilla <bugzilla_noreply@kde.org> wrote:
https://bugs.kde.org/show_bug.cgi?id=359927

--- Comment #1 from Filipe Saraiva <filipe@kde.org> ---
Hello Simone, I can not to reproduce this bug. Please, can you verify if you
have this bug yet?

I run the follow commands:

x = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
from matplotlib import pylab
pylab.clf()
pylab.plot(x)
pylab.show()

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