[Matplotlib-users] Cannot connect NavigationToolbar2QT

[Helmut Jarausch]

Hi,

I haven't used Matplotlib for a while but now I cannot use it anymore.
Even the simplest vector plot gives

import matplotlib.pyplot as plt
>>> x=[0.0,0.1,0.2,0.3,0.4,0.5]
>>> y=[x[i]**2 for i in range(0,6)]
>>> plt.plot(x,y)
QObject::connect: Cannot connect NavigationToolbar2QT::message(QString)  
to (null)::_show_message()
Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
   File "/usr/lib64/python3.5/site-packages/matplotlib/pyplot.py", line  
3147, in plot
     ax = gca()
   File "/usr/lib64/python3.5/site-packages/matplotlib/pyplot.py", line  
928, in gca
     return gcf().gca(**kwargs)
   File "/usr/lib64/python3.5/site-packages/matplotlib/pyplot.py", line  
578, in gcf
     return figure()
   File "/usr/lib64/python3.5/site-packages/matplotlib/pyplot.py", line  
527, in figure
     **kwargs)
   File  
"/usr/lib64/python3.5/site-packages/matplotlib/backends/backend_qt5agg.py",  
line 43, in new_figure_manager
     return new_figure_manager_given_figure(num, thisFig)
   File  
"/usr/lib64/python3.5/site-packages/matplotlib/backends/backend_qt5agg.py",  
line 51, in new_figure_manager_given_figure
     return FigureManagerQT(canvas, num)
   File  
"/usr/lib64/python3.5/site-packages/matplotlib/backends/backend_qt5.py",  
line 465, in __init__
     self.toolbar.message.connect(self._show_message)
TypeError: connect() failed between NavigationToolbar2QT.message[str]  
and _show_message()


Has anybody got an idea what's going wrong here?

I have compiled Matploblib from source on my Gentoo system using Python  
3.5.2  with the gtk3 and qt5 backend.

Many thanks for a hint,
Helmut