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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