import math def countdown(): """Returns a list with numbers counting down from 10 to 0""" last = 0 count = 10 numbers = [] while count >= last: numbers.append(count) count -= 1 return numbers print(countdown()) def Y20(theta, phi): """ Spherical harmonic Y20 for l=2, m=0 for angles theta and phi. See e.g. https://mathworld.wolfram.com/SphericalHarmonic.html Eq. 24 """ theta_rad = math.radians(theta) result= (0.25 * math.sqrt(5 / math.pi) * (3 * math.cos(theta_rad)**2 - 1)) def jacobsladder(top): """ Returns a list with numbers with increasing step size up to 'top'. The ladder starts at 0 and the stepsizes increase by 1 for each step, starting with stepsize 1. For example, for top = 10 you should get [0, 1, 3, 6, 10] """ x = 0 step = 1 numbers = [] while x <= top: numbers.append(x) x += step step += 1 return numbers