I got a very similar bug recently. I am using a rather big application
using the Qt4 backend for matplotlib on a debian testing distribution.
But after a full upgrade last Friday (December the 4th), I suddenly got
segfault everytime I was trying to display a matplotlib figure. After
searching around, I noticed that I my application works well everytime I
have to recreate the "pyc" file used to plot embedded matplotlib figures
(even by adding a single blank line). But if I do not change the file, I
got "segfault" on subsequent runs.
I tried to get a minimal program with the same effect but it did not
completely work since I get segfault on every run... More precisely, I
get segfault if I start to embed the figure, but do not go until I have
really plotted something inside. There is the code :
##############################################################
# -*- coding: utf-8 -*-
import sys
from PyQt4.QtCore import Qt
from PyQt4.QtGui import QApplication,QWidget,QVBoxLayout
if __name__ == "__main__":
app = QApplication(sys.argv)
from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as
FigureCanvas
from matplotlib.figure import Figure
class MyMplCanvas(FigureCanvas):
"""Ultimately, this is a QWidget (as well as a FigureCanvasAgg,
etc.)."""
def __init__(self, parent=None, width=5, height=4, dpi=100 ):
self.fig = Figure()
FigureCanvas.__init__(self, self.fig)
class MainWindow(QWidget):
#------------------------------------------------------------------------------
def __init__(self, parent=None) :
QWidget.__init__(self, parent)
self.setWindowFlags(Qt.Window)
# Next line only results in segfault
#~ self.canvas = MyMplCanvas()
# adding ALL following lines results in correct output
#~ v2 = QVBoxLayout()
#~ self.fig = self.canvas.fig
#~ self.ax1=self.fig.add_subplot(111)
#~ self.ax1.plot([0,1])
#~ v2.addWidget(self.canvas)
#~ self.setLayout(v2)
main=MainWindow()
main.show()
sys.exit(app.exec_())
#################################################
Comparing to the last answer to this bug, my only package differences are :
libc6 2.10.2
libglib2.0 2.22.3
libpango1.0 1.26.1
tcl8.5 8.5.8
tk8.5 8.5.8
I hope this can help.
Regards,
Nicolas Fourcaud-Trocmé
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