new_contents: from numpy import array, cross, eye, dot
  from scipy.linalg import expm3,norm
  from math import sin, cos
  
  def rotate(axis, vector, angle):
      if axis == 'x':
          m = array([
              [1, 0, 0],
              [0, cos(angle), -sin(angle)],
              [0, sin(angle), cos(angle)]
          ])
      elif axis == 'y':
          m = array([
              [cos(angle), 0, sin(angle)],
              [0, 1, 0],
              [-sin(angle), 0, cos(angle)]
          ])
      elif axis == 'z':
          m = array([
              [cos(angle), -sin(angle), 0],
              [sin(angle), cos(angle), 0],
              [0, 0, 1]
          ])
      else:
          raise Exception("axis needs to be x, y or z")
  
      return dot(m, vector)
  
subject: Add silly un-mathy rotation function