func_code: def overlap(x1=0, y1=0, r1=1, x2=1, y2=1, r2=1):
      distance_centre = int(sqrt((x2 - x1) ** 2 + (y2 - y1) ** 2))
      distance_radius = r1 + r2
      if distance_centre < distance_radius:
          return True
      else:
          return False