[Matplotlib-users] Unable to display data using matplotlib

[ashwinD12 .]

Hello,
          I am using this example from this cookbook -
http://nbviewer.jupyter.org/github/unidata/notebook-gallery/blob/master/notebooks/850mb_Temperature_Advection.ipynb

and I get this exception when I run it -

I am wondering whether I need to matplotlib.use('Tkagg') which I did add
but does not fix the problem.

File "/usr/lib/python3/dist-packages/matplotlib/backends/backend_agg.py",
line 474, in draw
self.figure.draw(self.renderer)File
"/usr/lib/python3/dist-packages/matplotlib/artist.py", line 61, in
draw_wrapper
draw(artist, renderer, *args, **kwargs)File
"/usr/lib/python3/dist-packages/matplotlib/figure.py", line 1159, in
draw
 func(*args)
 File "/usr/lib/python3/dist-packages/matplotlib/artist.py", line 61,
in draw_wrapper
 draw(artist, renderer, *args, **kwargs)
 File "/usr/local/lib/python3.5/dist-packages/cartopy/mpl/geoaxes.py",
line 355, in draw
inframe=inframe)File
"/usr/lib/python3/dist-packages/matplotlib/artist.py", line 61, in
draw_wrapper
draw(artist, renderer, *args, **kwargs)File
"/usr/lib/python3/dist-packages/matplotlib/axes/_base.py", line 2324,
in draw
a.draw(renderer)File
"/usr/lib/python3/dist-packages/matplotlib/artist.py", line 61, in
draw_wrapper
draw(artist, renderer, *args, **kwargs)
 File "/usr/local/lib/python3.5/dist-packages/cartopy/mpl/feature_artist.py",
line 103, in draw
geoms = self._feature.intersecting_geometries(extent)File
"/usr/local/lib/python3.5/dist-packages/cartopy/feature.py", line 113,
in intersecting_geometriesreturn (geom for geom in self.geometries()
if
 File "/usr/local/lib/python3.5/dist-packages/cartopy/feature.py",
line 180, in geometries
name=self.name)
 File "/usr/local/lib/python3.5/dist-packages/cartopy/io/shapereader.py",
line 246, in natural_earthreturn ne_downloader.path(format_dict)File
"/usr/local/lib/python3.5/dist-packages/cartopy/io/__init__.py", line
223, in path
result_path = self.acquire_resource(target_path, format_dict)File
"/usr/local/lib/python3.5/dist-packages/cartopy/io/shapereader.py",
line 301, in acquire_resource
shapefile_online = self._urlopen(url)File
"/usr/local/lib/python3.5/dist-packages/cartopy/io/__init__.py", line
262, in _urlopenreturn urlopen(url)File
"/usr/lib/python3.5/urllib/request.py", line 163, in urlopenreturn
opener.open(url, data, timeout)File
"/usr/lib/python3.5/urllib/request.py", line 472, in open
response = meth(req, response)File
"/usr/lib/python3.5/urllib/request.py", line 582, in
http_response'http', request, response, code, msg, hdrs)File
"/usr/lib/python3.5/urllib/request.py", line 504, in error
result = self._call_chain(*args)File
"/usr/lib/python3.5/urllib/request.py", line 444, in _call_chain
result = func(*args)File "/usr/lib/python3.5/urllib/request.py", line
696, in http_error_302return self.parent.open(new,
timeout=req.timeout)File "/usr/lib/python3.5/urllib/request.py", line
472, in open
response = meth(req, response)
 File "/usr/lib/python3.5/urllib/request.py", line 582, in
http_response'http', request, response, code, msg, hdrs)
 File "/usr/lib/python3.5/urllib/request.py", line 510, in errorreturn
self._call_chain(*args)File "/usr/lib/python3.5/urllib/request.py",
line 444, in _call_chain
result = func(*args)
 File "/usr/lib/python3.5/urllib/request.py", line 590, in http_error_default
  raise HTTPError(req.full_url, code, msg, hdrs, fp)
  urllib.error.HTTPError: HTTP Error 404: Not FoundTraceback (most
recent call last):
 File "tempAdv.py", line 72, in <module>
 plt.show()
 File "/usr/lib/python3/dist-packages/matplotlib/pyplot.py", line 244,
in showreturn _show(*args, **kw)
 File "/usr/lib/python3/dist-packages/matplotlib/backend_bases.py",
line 192, in __call__
 self.mainloop()


 File "/usr/lib/python3/dist-packages/matplotlib/backends/backend_tkagg.py",
line 74, in mainloop

 Tk.mainloop()

 File "/usr/lib/python3.5/tkinter/__init__.py", line 408, in mainloop
_default_root.tk.mainloop(n)

 AttributeError: 'NoneType' object has no attribute 'tk
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