Changer l'orientation (rotation) des labels d'une colorbar sous matplotlib

Exemple de comment tourner les labels d'une colorbar avec matplotlib:

import numpy as np
import matplotlib.pyplot as plt
import matplotlib.cm as cm
import matplotlib as mpl

x = np.linspace(-3.0, 3.0, 100)
y = np.linspace(-3.0, 3.0, 100)

X, Y = np.meshgrid(x, y)
Z = np.sqrt(X**2 + Y**2)

max_value = Z.max()
min_value = Z.min()

plt.figure()

cmap = cm.jet
bounds = [i for i in np.linspace(min_value,max_value,5)]
norm = mpl.colors.BoundaryNorm(bounds, cmap.N)

img = plt.imshow(Z, norm=norm)

cbar_ticks = [  bounds[i] + (bounds[i+1]-bounds[i]) / 2.0 for i in range(4)]
cbar_labels = ['Area 1','Area 2','Area 3','Area 4']

cbar = plt.colorbar(img, norm=norm, boundaries=bounds, ticks=cbar_ticks)
cbar.ax.set_yticklabels(cbar_labels, fontsize=10, rotation=90)

plt.title('Rotation of colorbar tick labels in matplotlib')

plt.savefig("rotation_of_colorbar_tick_labels_in_matplotlib.png", bbox_inches='tight')
plt.show()

Références