Issue saving figure as eps when using gouraud shaded triangulation #6226
Description
I'm running python 3.4 on Debian 8.3, and am using the Qt5Agg backend. When I call savefig() or use the toolbar widget to save a figure that has a gouraud shaded triangulation, I get the following stacktrace:
Traceback (most recent call last):
File "/home/tps/PyCharmProjects/test/test_PlotWindow.py", line 323, in saveFigRButtonClicked
savefig(fname)
File "/usr/local/lib/python3.4/dist-packages/matplotlib/pyplot.py", line 688, in savefig
res = fig.savefig(*args, **kwargs)
File "/usr/local/lib/python3.4/dist-packages/matplotlib/figure.py", line 1565, in savefig
self.canvas.print_figure(*args, **kwargs)
File "/usr/local/lib/python3.4/dist-packages/matplotlib/backends/backend_qt5agg.py", line 196, in print_figure
FigureCanvasAgg.print_figure(self, *args, **kwargs)
File "/usr/local/lib/python3.4/dist-packages/matplotlib/backend_bases.py", line 2232, in print_figure
**kwargs)
File "/usr/local/lib/python3.4/dist-packages/matplotlib/backends/backend_ps.py", line 995, in print_eps
return self._print_ps(outfile, 'eps', *args, **kwargs)
File "/usr/local/lib/python3.4/dist-packages/matplotlib/backends/backend_ps.py", line 1023, in _print_ps
**kwargs)
File "/usr/local/lib/python3.4/dist-packages/matplotlib/backends/backend_ps.py", line 1113, in _print_figure
self.figure.draw(renderer)
File "/usr/local/lib/python3.4/dist-packages/matplotlib/artist.py", line 61, in draw_wrapper
draw(artist, renderer, *args, **kwargs)
File "/usr/local/lib/python3.4/dist-packages/matplotlib/figure.py", line 1159, in draw
func(*args)
File "/usr/local/lib/python3.4/dist-packages/matplotlib/artist.py", line 61, in draw_wrapper
draw(artist, renderer, *args, **kwargs)
File "/usr/local/lib/python3.4/dist-packages/matplotlib/axes/_base.py", line 2324, in draw
a.draw(renderer)
File "/usr/local/lib/python3.4/dist-packages/matplotlib/artist.py", line 61, in draw_wrapper
draw(artist, renderer, *args, **kwargs)
File "/usr/local/lib/python3.4/dist-packages/matplotlib/collections.py", line 1694, in draw
renderer.draw_gouraud_triangles(gc, verts, colors, transform.frozen())
File "/usr/local/lib/python3.4/dist-packages/matplotlib/backends/backend_ps.py", line 867, in draw_gouraud_triangles
stream = quote_ps_string(streamarr.tostring())
File "/usr/local/lib/python3.4/dist-packages/matplotlib/backends/backend_ps.py", line 170, in quote_ps_string
s=s.replace("\\", "\\\\")
TypeError: expected bytes, bytearray or buffer compatible object