PyQt5 pyplot error

[plooney]

Ubuntu 16.04
Python 3.5.2
matplotlib 1.5.1
PyQt5 5.7

Installed using pip in anaconda

QObject::connect: Cannot connect NavigationToolbar2QT::message(QString) to (null)::_show_message()
Traceback (most recent call last):
File "test_conv.py", line 14, in
plt.plot(xvals)
File "/home/padraig/.local/lib/python3.5/site-packages/matplotlib/pyplot.py", line 3147, in plot
ax = gca()
File "/home/padraig/.local/lib/python3.5/site-packages/matplotlib/pyplot.py", line 928, in gca
return gcf().gca(*_kwargs)
File "/home/padraig/.local/lib/python3.5/site-packages/matplotlib/pyplot.py", line 578, in gcf
return figure()
File "/home/padraig/.local/lib/python3.5/site-packages/matplotlib/pyplot.py", line 527, in figure
*_kwargs)
File "/home/padraig/.local/lib/python3.5/site-packages/matplotlib/backends/backend_qt5agg.py", line 43, in new_figure_manager
return new_figure_manager_given_figure(num, thisFig)
File "/home/padraig/.local/lib/python3.5/site-packages/matplotlib/backends/backend_qt5agg.py", line 51, in new_figure_manager_given_figure
return FigureManagerQT(canvas, num)
File "/home/padraig/.local/lib/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()

[Kojoley]

Duplicate #6853

[tacaswell]

Closed by #6854

[mogrodnik]

I am having similar output after updating (with portage):
sip-4.19.1 [from 4.18]
PyQt5-5.7.1 [from 5.5.1]
PyQt4-4.12 [from 4.11.4-r1]
and trying to run any plotting script.

Error message is:
QObject::connect: Cannot connect NavigationToolbar2QT::message(QString) to (null)::_show_message()
Traceback (most recent call last):
File "2.py", line 5, in
plt.xlim (0.1 , 5.0 )
File "/usr/lib64/python3.4/site-packages/matplotlib/pyplot.py", line 1488, in xlim
ax = gca()
File "/usr/lib64/python3.4/site-packages/matplotlib/pyplot.py", line 828, in gca
ax = gcf().gca(**kwargs)
File "/usr/lib64/python3.4/site-packages/matplotlib/pyplot.py", line 462, in gcf
return figure()
File "/usr/lib64/python3.4/site-packages/matplotlib/pyplot.py", line 435, in figure
**kwargs)
File "/usr/lib64/python3.4/site-packages/matplotlib/backends/backend_qt5agg.py", line 48, in new_figure_manager
return new_figure_manager_given_figure(num, thisFig)
File "/usr/lib64/python3.4/site-packages/matplotlib/backends/backend_qt5agg.py", line 56, in new_figure_manager_given_figure
return FigureManagerQT(canvas, num)
File "/usr/lib64/python3.4/site-packages/matplotlib/backends/backend_qt5.py", line 481, in init
self.toolbar.message.connect(self._show_message)
TypeError: connect() failed between NavigationToolbar2QT.message[str] and _show_message()

With my current configuration this can be reproduced with plotting script using matplotlib, enough should be just:
from pylab import *
import matplotlib.pyplot as plt
plt.xlim (0.1 , 5.0 )

I use matplotlib 1.4.3
python version 2.7.12 (result is the same for python 3.4.5)
platform version 1.0.7
on gentoo (version 4.4.39-gentoo (root@migi) (gcc version 4.9.4 (Gentoo 4.9.4 p1.0, pie-0.6.4) ) #1 SMP Mon Feb 20 15:16:15 CET 2017)

If sip, PyQt4 and PyQt5 are downgraded to previously used versions, everything runs smoothly.

[QuLogic]

As you can see from the milestone, this bug was fixed in 2.0.0; 1.4.3 is very old now.

[fstefanoni]

Hi!
I use matplotlib 1.5.1, Python 3.5.2 and Anaconda 4.1.1.
I get the same error message:

QObject::connect: Cannot connect NavigationToolbar2QT::message(QString) to (null)::_show_message()
Traceback (most recent call last):
File "/Users/francescastefanoni/Desktop/read.py", line 27, in
plt.plot(t,IOP)
File "/Users/francescastefanoni/anaconda/lib/python3.5/site-packages/matplotlib/pyplot.py", line 3147, in plot
ax = gca()
File "/Users/francescastefanoni/anaconda/lib/python3.5/site-packages/matplotlib/pyplot.py", line 928, in gca
return gcf().gca(**kwargs)
File "/Users/francescastefanoni/anaconda/lib/python3.5/site-packages/matplotlib/pyplot.py", line 578, in gcf
return figure()
File "/Users/francescastefanoni/anaconda/lib/python3.5/site-packages/matplotlib/pyplot.py", line 527, in figure
**kwargs)
File "/Users/francescastefanoni/anaconda/lib/python3.5/site-packages/matplotlib/backends/backend_qt5agg.py", line 43, in new_figure_manager
return new_figure_manager_given_figure(num, thisFig)
File "/Users/francescastefanoni/anaconda/lib/python3.5/site-packages/matplotlib/backends/backend_qt5agg.py", line 51, in new_figure_manager_given_figure
return FigureManagerQT(canvas, num)
File "/Users/francescastefanoni/anaconda/lib/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()

Does anybody know which is the problem and how to solve it?? Thank you

[jenshnielsen]

@fstefanoni this was fixed in matplotlib 1.5.3 you will have to upgrade to at least that version to get the fix

[fstefanoni]

@jenshnielsen thank you very much!! Now it works:)