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====== Backend ======
  * Show current backend
<code>
import matplotlib
matplotlib.pyplot.get_backend()
# or
matplotlib.rcParams['backend']
</code>

  * Setup backend
<code>
import matplotlib
matplotlib.use('GTKAgg')
</code>

  * Show all possible backends
<code>
import matplotlib
matplotlib.rcsetup.interactive_bk
matplotlib.rcsetup.non_interactive_bk
matplotlib.rcsetup.all_backends
</code>

====== Troubleshooting ======
  * When close a figure window, the following information jump out:
<code>
/usr/lib/python2.7/dist-packages/matplotlib/backends/backend_gtk.py:253: Warning: Source ID 70 was not found when attempting to remove it
  gobject.source_remove(self._idle_event_id)
</code>

The solution is to modify /usr/lib/python2.7/dist-packages/matplotlib/backend_bases.py by adding "return True" to the end of function "def idle_event(self, guiEvent=None):". [[https://github.com/matplotlib/matplotlib/pull/3769 | Ref]]

    *When want to modify the font types of labels,titles...[[https://stackoverflow.com/questions/21321670/how-to-change-fonts-in-matplotlib-python |Ref]]
<code>
csfont = {'fontname':'Comic Sans MS'}
hfont = {'fontname':'Helvetica'}

plt.title('title',**csfont)
plt.xlabel('xlabel', **hfont)
plt.show()
</code>