How can I invert the y_axis? Z is a np.array.Thank you
Z=TempLake
X,Y=np.meshgrid(range(Z.shape[0]+1),range(Z.shape[1]+1))
im = plt.pcolormesh(X,Y,Z.transpose(), cmap='hot')
plt.colorbar(im, orientation='horizontal')
plt.show()
I have this:

I need this:

As @Chris said, this can be done with:
Before the ‘plt.show()’.