---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-8-51e1c1b21bd7> in <module>
     34 # ax.axvspan(start, end, facecolor='g', alpha=0.2, label="A very significant event")
     35 # grrr -- export to svg does not work on this file! Export to PDF and convert to svg in Inkscape
---> 36 plt.savefig("fun.svg")

~/Applications/miniconda3/envs/jl10/lib/python3.7/site-packages/matplotlib/pyplot.py in savefig(*args, **kwargs)
    720 def savefig(*args, **kwargs):
    721     fig = gcf()
--> 722     res = fig.savefig(*args, **kwargs)
    723     fig.canvas.draw_idle()   # need this if 'transparent=True' to reset colors
    724     return res

~/Applications/miniconda3/envs/jl10/lib/python3.7/site-packages/matplotlib/figure.py in savefig(self, fname, transparent, **kwargs)
   2178             self.patch.set_visible(frameon)
   2179 
-> 2180         self.canvas.print_figure(fname, **kwargs)
   2181 
   2182         if frameon:

~/Applications/miniconda3/envs/jl10/lib/python3.7/site-packages/matplotlib/backend_bases.py in print_figure(self, filename, dpi, facecolor, edgecolor, orientation, format, bbox_inches, **kwargs)
   2080                     orientation=orientation,
   2081                     bbox_inches_restore=_bbox_inches_restore,
-> 2082                     **kwargs)
   2083             finally:
   2084                 if bbox_inches and restore_bbox:

~/Applications/miniconda3/envs/jl10/lib/python3.7/site-packages/matplotlib/backends/backend_svg.py in print_svg(self, filename, *args, **kwargs)
   1200                 detach = True
   1201 
-> 1202             result = self._print_svg(filename, fh, **kwargs)
   1203 
   1204             # Detach underlying stream from wrapper so that it remains open in

~/Applications/miniconda3/envs/jl10/lib/python3.7/site-packages/matplotlib/backends/backend_svg.py in _print_svg(self, filename, fh, dpi, bbox_inches_restore, **kwargs)
   1225             bbox_inches_restore=bbox_inches_restore)
   1226 
-> 1227         self.figure.draw(renderer)
   1228         renderer.finalize()
   1229 

~/Applications/miniconda3/envs/jl10/lib/python3.7/site-packages/matplotlib/artist.py in draw_wrapper(artist, renderer, *args, **kwargs)
     36                 renderer.start_filter()
     37 
---> 38             return draw(artist, renderer, *args, **kwargs)
     39         finally:
     40             if artist.get_agg_filter() is not None:

~/Applications/miniconda3/envs/jl10/lib/python3.7/site-packages/matplotlib/figure.py in draw(self, renderer)
   1707             self.patch.draw(renderer)
   1708             mimage._draw_list_compositing_images(
-> 1709                 renderer, self, artists, self.suppressComposite)
   1710 
   1711             renderer.close_group('figure')

~/Applications/miniconda3/envs/jl10/lib/python3.7/site-packages/matplotlib/image.py in _draw_list_compositing_images(renderer, parent, artists, suppress_composite)
    133     if not_composite or not has_images:
    134         for a in artists:
--> 135             a.draw(renderer)
    136     else:
    137         # Composite any adjacent images together

~/Applications/miniconda3/envs/jl10/lib/python3.7/site-packages/matplotlib/artist.py in draw_wrapper(artist, renderer, *args, **kwargs)
     36                 renderer.start_filter()
     37 
---> 38             return draw(artist, renderer, *args, **kwargs)
     39         finally:
     40             if artist.get_agg_filter() is not None:

~/Applications/miniconda3/envs/jl10/lib/python3.7/site-packages/matplotlib/axes/_base.py in draw(self, renderer, inframe)
   2645             renderer.stop_rasterizing()
   2646 
-> 2647         mimage._draw_list_compositing_images(renderer, self, artists)
   2648 
   2649         renderer.close_group('axes')

~/Applications/miniconda3/envs/jl10/lib/python3.7/site-packages/matplotlib/image.py in _draw_list_compositing_images(renderer, parent, artists, suppress_composite)
    133     if not_composite or not has_images:
    134         for a in artists:
--> 135             a.draw(renderer)
    136     else:
    137         # Composite any adjacent images together

~/Applications/miniconda3/envs/jl10/lib/python3.7/site-packages/matplotlib/artist.py in draw_wrapper(artist, renderer, *args, **kwargs)
     36                 renderer.start_filter()
     37 
---> 38             return draw(artist, renderer, *args, **kwargs)
     39         finally:
     40             if artist.get_agg_filter() is not None:

~/Applications/miniconda3/envs/jl10/lib/python3.7/site-packages/matplotlib/text.py in draw(self, renderer)
   2367         # Draw text, including FancyBboxPatch, after FancyArrowPatch.
   2368         # Otherwise, a wedge arrowstyle can land partly on top of the Bbox.
-> 2369         Text.draw(self, renderer)
   2370 
   2371     def get_window_extent(self, renderer=None):

~/Applications/miniconda3/envs/jl10/lib/python3.7/site-packages/matplotlib/artist.py in draw_wrapper(artist, renderer, *args, **kwargs)
     36                 renderer.start_filter()
     37 
---> 38             return draw(artist, renderer, *args, **kwargs)
     39         finally:
     40             if artist.get_agg_filter() is not None:

~/Applications/miniconda3/envs/jl10/lib/python3.7/site-packages/matplotlib/text.py in draw(self, renderer)
    716                     textrenderer.draw_text(gc, x, y, clean_line,
    717                                            textobj._fontproperties, angle,
--> 718                                            ismath=ismath, mtext=mtext)
    719 
    720         gc.restore()

~/Applications/miniconda3/envs/jl10/lib/python3.7/site-packages/matplotlib/backends/backend_svg.py in draw_text(self, gc, x, y, s, prop, angle, ismath, mtext)
   1160             self._draw_text_as_path(gc, x, y, s, prop, angle, ismath, mtext)
   1161         else:
-> 1162             self._draw_text_as_text(gc, x, y, s, prop, angle, ismath, mtext)
   1163 
   1164         if gc.get_url() is not None:

~/Applications/miniconda3/envs/jl10/lib/python3.7/site-packages/matplotlib/backends/backend_svg.py in _draw_text_as_text(self, gc, x, y, s, prop, angle, ismath, mtext)
   1044                 # Get anchor coordinates.
   1045                 transform = mtext.get_transform()
-> 1046                 ax, ay = transform.transform_point(mtext.get_position())
   1047                 ay = self.height - ay
   1048 

~/Applications/miniconda3/envs/jl10/lib/python3.7/site-packages/matplotlib/transforms.py in transform_point(self, point)
   1479         if len(point) != self.input_dims:
   1480             raise ValueError("The length of 'point' must be 'self.input_dims'")
-> 1481         return self.transform(np.asarray([point]))[0]
   1482 
   1483     def transform_path(self, path):

~/Applications/miniconda3/envs/jl10/lib/python3.7/site-packages/matplotlib/transforms.py in transform(self, values)
   1392 
   1393         # Transform the values
-> 1394         res = self.transform_affine(self.transform_non_affine(values))
   1395 
   1396         # Convert the result back to the shape of the input values.

~/Applications/miniconda3/envs/jl10/lib/python3.7/site-packages/matplotlib/transforms.py in transform_affine(self, points)
   2371     def transform_affine(self, points):
   2372         # docstring inherited
-> 2373         return self.get_affine().transform(points)
   2374 
   2375     def transform_non_affine(self, points):

~/Applications/miniconda3/envs/jl10/lib/python3.7/site-packages/matplotlib/transforms.py in transform(self, values)
   1696     def transform(self, values):
   1697         # docstring inherited
-> 1698         return self.transform_affine(values)
   1699 
   1700     def transform_affine(self, values):

~/Applications/miniconda3/envs/jl10/lib/python3.7/site-packages/matplotlib/transforms.py in transform_affine(self, points)
   1779             tpoints = affine_transform(points.data, mtx)
   1780             return np.ma.MaskedArray(tpoints, mask=np.ma.getmask(points))
-> 1781         return affine_transform(points, mtx)
   1782 
   1783     def transform_point(self, point):

TypeError: Cannot cast array data from dtype('<U7') to dtype('float64') according to the rule 'safe'