Rotation of colorbar tick labels in matplotlib

Question

I would like to rotate the colorbar tick labels so that they read vertically rather than horizontally. I have tried as many variations as I can think of with cbar.ax.s

Answer 1

If you're happy with tick locations and labels and only want to rotate them:

cbar.ax.set_xticklabels(cbar.ax.get_xticklabels(), rotation='vertical')

Answer 2

You can use cbar.ax.set_xticklabels to change the rotation (or set_yicklabels if you had a vertical colorbar).

cbar.ax.set_xticklabels(clevs1[::1],rotation=90)

EDIT:

To set the ticks correctly, you can search for where in your clevs1 array the first tick should be using np.argmin, and use that to index clevs1 when you set_xticklabels:

tick_start = np.argmin(abs(clevs1-clevs[0]))
cbar.ax.set_xticklabels(clevs1[tick_start:],rotation=90)