func_code: def distance_between_points(x1, y1, x2, y2):
      return sqrt((x2 - x1) ** 2 + (y2 - y1) ** 2)
  
  
  def overlap(x1=0, y1=0, r1=1, x2=0, y2=0, r2=1):
      distance = distance_between_points(x1, y1, x2, y2)
      return distance < r1 + r2