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l stuck with this error please help

 File "/usr/lib/python3/dist-packages/matplotlib/backends/backend_gtk.py", line 16, in <module>
    raise ImportError("Gtk* backend requires pygtk to be installed.")
ImportError: Gtk* backend requires pygtk to be installed
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I could solve this issue by changing the backend to TkAgg. Simply go to your .matplotlibrc file and change the backend.

Usually the file is saved in home directory: ~/.matplotlibrc

If it is not there, you can try to look into:

/usr/local/lib/python3.4/dist-packages/matplotlib/mpl-data/matplotlibrc

Here you need to replace the python version 3.4 by yours.

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