importmatplotlib.pyplotaspltimportnumpyasnp# Make fake datad=np.random.rand(11,18)azimuths=np.radians(np.arange(-42.5,42.6,5))radials=np.linspace(1.3,3.9,11)r,theta=np.meshgrid(radials,azimuths)# Plot the datafig=plt.figure(figsize=(6,6))ax1=fig.add_subplot(111,polar=True)cont=ax1.contourf(theta,r,np.fliplr(d).T,                   )ax1.set_theta_zero_location('N')ax1.set_thetamin(-45)ax1.set_thetamax(45)ax1.set_xticks(np.arange(np.radians(-45),np.radians(46),np.radians(15),                       ))# Less radial ticksax1.set_xticklabels(np.arange(-45,46,15)[::-1],fontsize='xx-large',# This argument controls azimuthal tick labels                   )ax1.set_yticklabels(np.arange(-45,46,15)[::-1],fontsize='xx-large',# So why does this not control the radial tick labels?                   )# ax1.yaxis.set_tick_params(labelsize='xx-large')      # Especially when this line *does* control themplt.show()