matplotlib - only 1 colorbar for multiple pie chart using matlibplot -

i have such plot, , add colorbar code (which color corresponds number) on right hand below. saw example used imshow not pie chart.

#!/usr/bin/env python """ http://matplotlib.sf.net/matplotlib.pylab.html#-pie docstring. """ pylab import *  fracs = [33,33,33] starting_angle = 90 axis('equal')  item in range(9):     color_vals = [-1, 0, 1]     my_norm = matplotlib.colors.normalize(-1, 1) # maps data range [0, 1]     my_cmap = matplotlib.cm.get_cmap('rdbu') # can pick color map      patches, texts, autotexts = pie(fracs, labels = none, autopct='%1.1f%%', startangle=90, colors=my_cmap(my_norm(color_vals)))     subplot(3,3,item+1)      fracs = [33,33,33]     starting_angle = 90     axis('equal')     patches, texts, autotexts = pie(fracs, labels = none, autopct='%1.1f%%', startangle=90, colors=my_cmap(my_norm(color_vals)))   item in autotexts:     item.set_text("")   subplots_adjust(left=0.125, bottom=0.1, right=0.9, top=0.9, wspace=0.0, hspace=0.5)  savefig('/home/superiois/downloads/projectx3/grail/pie1.png') show() 

also, great if tell me how customize size , location of colorbar code; thanks.

usually legend more appropriate discrete values , colorbar continuous values. said, off course possible since mpl allows create colorbar scratch.

import matplotlib.pyplot plt import matplotlib mpl  fracs = [33,33,33] starting_angle = 90  fig, axs = plt.subplots(3,3, figsize=(6,6)) fig.subplots_adjust(hspace=0.1,wspace=0.0)  axs = axs.ravel()  n in range(9):     color_vals = [-1, 0, 1]     my_norm = mpl.colors.normalize(-1, 1) # maps data range [0, 1]     my_cmap = mpl.cm.get_cmap('rdbu', len(color_vals)) # can pick color map      patches, texts, autotexts = axs[n].pie(fracs, labels = none, autopct='%1.1f%%', startangle=90, colors=my_cmap(my_norm(color_vals)))     axs[n].set_aspect('equal')      item in autotexts:         item.set_text("")  ax_cb = fig.add_axes([.9,.25,.03,.5]) cb = mpl.colorbar.colorbarbase(ax_cb, cmap=my_cmap, norm=my_norm, ticks=color_vals)  cb.set_label('some label [-]') cb.set_ticklabels(['one', 'two', 'three']) 

i have added custom ticklabels show how work, default values remove last line.