Description
Bug report
Bug summary
Hi. We are using CI of our project with PySide and pre releases of matplotlib. We notice that since 2.1.0rc1 all our tests fails with this kind or error message:
TypeError: PySide.QtCore.QObject isn't a direct base class of ClassBlahblahblah
After introspection we think that the problem come from matplotlib 2.1.0rc1, but it was too difficult to identify why. Using the previour version of matplotlib does not occur any problem.
The problem looks critical.
Any idea why this issue happens?
Code for reproduction
import logging
logging.basicConfig()
from PySide import QtGui
logger = logging.getLogger("test")
app = QtGui.QApplication([])
class Foo_super(QtGui.QWidget):
def __init__(self, parent=None):
super(Foo_super, self).__init__(parent)
class Foo_oldschool(QtGui.QWidget):
def __init__(self, parent=None):
QtGui.QWidget.__init__(self, parent)
import matplotlib
matplotlib.use('Qt4Agg')
from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.figure import Figure
fig = Figure(figsize=(600,600), dpi=72, facecolor=(1,1,1), edgecolor=(0,0,0))
ax = fig.add_subplot(111)
ax.plot([0,1])
try:
a = Foo_super()
except Exception as e:
logger.error("Backtrace 1", exc_info=True)
try:
a = Foo_oldschool()
except Exception as e:
logger.error("Backtrace 2", exc_info=True)
canvas = FigureCanvas(fig)
try:
a = Foo_super()
except Exception as e:
logger.error("Backtrace 3", exc_info=True)
try:
a = Foo_oldschool()
except Exception as e:
logger.error("Backtrace 4", exc_info=True)Actual outcome
ERROR:test:Backtrace 3
Traceback (most recent call last):
File "test_matplotlib_vs_pyside.py", line 47, in <module>
a = Foo_super()
File "test_matplotlib_vs_pyside.py", line 14, in __init__
super(Foo_super, self).__init__(parent)
TypeError: PySide.QtCore.QObject isn't a direct base class of Foo_super
ERROR:test:Backtrace 4
Traceback (most recent call last):
File "test_matplotlib_vs_pyside.py", line 52, in <module>
a = Foo_oldschool()
File "test_matplotlib_vs_pyside.py", line 19, in __init__
QtGui.QWidget.__init__(self, parent)
TypeError: PySide.QtCore.QObject isn't a direct base class of Foo_oldschool
Expected outcome
As you can see, after the use of canvas = FigureCanvas(fig), we are not able anymore to instantiate a very simple custom widget. Using old or new way to call inherited __init__ do not change anything.
Matplotlib version
Our CI is on Windows.
But I can reproduce it on my system with a fresh virtualenv, compiling everything using pip: numpy, matplotlib and PySide.
- Operating System: Debian 8
- Matplotlib Version: 2.1.0rc1
- Python Version: Python 2.7.9
- Other Libraries:
Package Version
---------------------------------- --------
backports.functools-lru-cache 1.4
backports.shutil-get-terminal-size 1.0.0
cycler 0.10.0
decorator 4.1.2
enum34 1.1.6
ipython 5.4.1
ipython-genutils 0.2.0
matplotlib 2.1.0rc1
numpy 1.13.1
pathlib2 2.3.0
pexpect 4.2.1
pickleshare 0.7.4
pip 9.0.1
prompt-toolkit 1.0.15
ptyprocess 0.5.2
Pygments 2.2.0
pyparsing 2.2.0
PySide 1.2.4
python-dateutil 2.6.1
pytz 2017.2
scandir 1.5
setuptools 36.4.0
simplegeneric 0.8.1
six 1.10.0
subprocess32 3.2.7
traitlets 4.3.2
wcwidth 0.1.7
wheel 0.30.0a0
- There is no problem with the same environment and using matplotlib 2.0.0 or 2.0.2.