gistfile1.pytb

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-33-9be617700fcd> in <module>()
      6     t = ax.plot(times, events, lw=1, c=random_color())
      7 ax.set_yscale('log')
----> 8 IPython.core.pylabtools.print_figure(fig)

/usr/lib/python2.6/site-packages/IPython/core/pylabtools.pyc in print_figure(fig, fmt)
    108         fmt = 'png'
    109     fig.canvas.print_figure(bytes_io, format=fmt, bbox_inches='tight',
--> 110                             facecolor=fc, edgecolor=ec, dpi=dpi)
    111     data = bytes_io.getvalue()
    112     return data

/usr/lib64/python2.6/site-packages/matplotlib/backend_bases.pyc in print_figure(self, filename, dpi, facecolor, edgecolor, orientation, format, **kwargs)
   2165                     orientation=orientation,
   2166                     dryrun=True,
-> 2167                     **kwargs)
   2168                 renderer = self.figure._cachedRenderer
   2169                 bbox_inches = self.figure.get_tightbbox(renderer)

/usr/lib64/python2.6/site-packages/matplotlib/backends/backend_agg.pyc in print_png(self, filename_or_obj, *args, **kwargs)
    503 
    504     def print_png(self, filename_or_obj, *args, **kwargs):
--> 505         FigureCanvasAgg.draw(self)
    506         renderer = self.get_renderer()
    507         original_dpi = renderer.dpi

/usr/lib64/python2.6/site-packages/matplotlib/backends/backend_agg.pyc in draw(self)
    449 
    450         try:
--> 451             self.figure.draw(self.renderer)
    452         finally:
    453             RendererAgg.lock.release()

/usr/lib64/python2.6/site-packages/matplotlib/artist.pyc in draw_wrapper(artist, renderer, *args, **kwargs)
     53     def draw_wrapper(artist, renderer, *args, **kwargs):
     54         before(artist, renderer)
---> 55         draw(artist, renderer, *args, **kwargs)
     56         after(artist, renderer)
     57 

/usr/lib64/python2.6/site-packages/matplotlib/figure.pyc in draw(self, renderer)
   1051         dsu.sort(key=itemgetter(0))
   1052         for zorder, a, func, args in dsu:
-> 1053             func(*args)
   1054 
   1055         renderer.close_group('figure')

/usr/lib64/python2.6/site-packages/matplotlib/artist.pyc in draw_wrapper(artist, renderer, *args, **kwargs)
     53     def draw_wrapper(artist, renderer, *args, **kwargs):
     54         before(artist, renderer)
---> 55         draw(artist, renderer, *args, **kwargs)
     56         after(artist, renderer)
     57 

/usr/lib64/python2.6/site-packages/matplotlib/axes.pyc in draw(self, renderer, inframe)
   2083 
   2084         for zorder, a in dsu:
-> 2085             a.draw(renderer)
   2086 
   2087         renderer.close_group('axes')

/usr/lib64/python2.6/site-packages/matplotlib/artist.pyc in draw_wrapper(artist, renderer, *args, **kwargs)
     53     def draw_wrapper(artist, renderer, *args, **kwargs):
     54         before(artist, renderer)
---> 55         draw(artist, renderer, *args, **kwargs)
     56         after(artist, renderer)
     57 

/usr/lib64/python2.6/site-packages/matplotlib/axis.pyc in draw(self, renderer, *args, **kwargs)
   1095         ticks_to_draw = self._update_ticks(renderer)
   1096         ticklabelBoxes, ticklabelBoxes2 = self._get_tick_bboxes(ticks_to_draw,
-> 1097                                                                 renderer)
   1098 
   1099         for tick in ticks_to_draw:

/usr/lib64/python2.6/site-packages/matplotlib/axis.pyc in _get_tick_bboxes(self, ticks, renderer)
   1044         for tick in ticks:
   1045             if tick.label1On and tick.label1.get_visible():
-> 1046                 extent = tick.label1.get_window_extent(renderer)
   1047                 ticklabelBoxes.append(extent)
   1048             if tick.label2On and tick.label2.get_visible():

/usr/lib64/python2.6/site-packages/matplotlib/text.pyc in get_window_extent(self, renderer, dpi)
    752             raise RuntimeError('Cannot get window extent w/o renderer')
    753 
--> 754         bbox, info, descent = self._get_layout(self._renderer)
    755         x, y = self.get_position()
    756         x, y = self.get_transform().transform_point((x, y))

/usr/lib64/python2.6/site-packages/matplotlib/text.pyc in _get_layout(self, renderer)
    327                 w, h, d = get_text_width_height_descent(clean_line,
    328                                                         self._fontproperties,
--> 329                                                         ismath=ismath)
    330             else:
    331                 w, h, d = 0, 0, 0

/usr/lib64/python2.6/site-packages/matplotlib/backends/backend_agg.pyc in get_text_width_height_descent(self, s, prop, ismath)
    208         if ismath:
    209             ox, oy, width, height, descent, fonts, used_characters = \
--> 210                 self.mathtext_parser.parse(s, self.dpi, prop)
    211             return width, height, descent
    212 

/usr/lib64/python2.6/site-packages/matplotlib/mathtext.pyc in parse(self, s, dpi, prop)
   3007         # with each request.
   3008         if self._parser is None:
-> 3009             self.__class__._parser = Parser()
   3010 
   3011         box = self._parser.parse(s, font_output, fontsize, dpi)

/usr/lib64/python2.6/site-packages/matplotlib/mathtext.pyc in __init__(self)
   2191         space         <<= oneOf(self._space_widths.keys())
   2192         customspace   <<= (Suppress(Literal(r'\hspace'))
-> 2193                           - ((lbrace + float_literal + rbrace)
   2194                             | Error(r"Expected \hspace{n}")))
   2195 

TypeError: unsupported operand type(s) for +: 'NoneType' and 'NoneType'

<matplotlib.figure.Figure at 0x3e09e90>