new_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  
  import math
  
  print 'Insert one points, separated with commas: '
  xy = input('Insert first point: ')
  x2y2 = input('Insert second point: ')
  
  def substractVectors(a, b):
    return (a[0] - b[0], a[1] - b[1])
  
  def normalize(x, y):
    return math.sqrt(x**2 + y**2)
  
  print normalize(*xy)
  print normalize(*x2y2)
  
subject: Add normalize and Vector substraction functions