I probably should have sent this to the devel list instead of the user list. Is anyone else running into a similar problem with Qt, or is something in my install screwy?
Thanks, -Tony ---------- Forwarded message ---------- From: Tony Yu <tsy...@gmail.com> Date: Mon, Jul 18, 2011 at 5:58 PM Subject: IOError: [Errno 4] Interrupted system call (Qt4 backend) To: matplotlib-users <matplotlib-us...@lists.sourceforge.net> When using the Qt4 backend, I'm getting an IOError similar to the one detailed in: http://old.nabble.com/matplotlib-with-Qt4-backend-td26311369.html But it's definitely a separate issue (see Traceback below). This issue also seems specific to Qt (I couldn't reproduce it on 'macosx', 'tkagg', or 'agg' backends). I found a number of other people who ran into similar problems with Qt. Their solutions tend to be: catch the error and just try running the process again. I'm on Qt 4.7.3, OS X 10.6.8, Matplotlib trunk. Any help would be much appreciated. -Tony Script reproducing issue ======================== import matplotlib matplotlib.use('qt4agg') import matplotlib.pyplot as plt for n in xrange(300): plt.plot([0, 1]) plt.savefig('test.jpg') # Since it's a signaling issue, it gets triggered randomly, so the attached # script may or not reproduce the issue. Traceback ========= traceback (most recent call last): File "qterror.py", line 8, in <module> plt.savefig('test.jpg') File "/Users/Tony/python/devel/mpl/lib/matplotlib/pyplot.py", line 428, in savefig return fig.savefig(*args, **kwargs) File "/Users/Tony/python/devel/mpl/lib/matplotlib/figure.py", line 1162, in savefig self.canvas.print_figure(*args, **kwargs) File "/Users/Tony/python/devel/mpl/lib/matplotlib/backends/backend_qt4agg.py", line 153, in print_figure FigureCanvasAgg.print_figure(self, *args, **kwargs) File "/Users/Tony/python/devel/mpl/lib/matplotlib/backend_bases.py", line 1979, in print_figure **kwargs) File "/Users/Tony/python/devel/mpl/lib/matplotlib/backend_bases.py", line 1799, in print_jpg buf, size = agg.print_to_buffer() File "/Users/Tony/python/devel/mpl/lib/matplotlib/backends/backend_agg.py", line 45 7, in print_to_buffer FigureCanvasAgg.draw(self) File "/Users/Tony/python/devel/mpl/lib/matplotlib/backends/backend_agg.py", line 40 0, in draw self.renderer = self.get_renderer() File "/Users/Tony/python/devel/mpl/lib/matplotlib/backends/backend_agg.py", line 41 1, in get_renderer self.renderer = RendererAgg(w, h, self.figure.dpi) File "/Users/Tony/python/devel/mpl/lib/matplotlib/backends/backend_agg.py", line 51 , in __init__ RendererBase.__init__(self) File "/Users/Tony/python/devel/mpl/lib/matplotlib/backend_bases.py", line 114, in _ _init__ self._text2path = textpath.TextToPath() File "/Users/Tony/python/devel/mpl/lib/matplotlib/textpath.py", line 37, in __init_ _ self._adobe_standard_encoding = self._get_adobe_standard_encoding() File "/Users/Tony/python/devel/mpl/lib/matplotlib/textpath.py", line 41, in _get_ad obe_standard_encoding enc_name = dviread.find_tex_file('8a.enc') File "/Users/Tony/python/devel/mpl/lib/matplotlib/dviread.py", line 837, in find_te x_file result = pipe.communicate()[0].rstrip() File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/subpro cess.py", line 663, in communicate stdout = self.stdout.read() IOError: [Errno 4] Interrupted system call
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