func_code: def overlap(x1=0, y1=0, r1=1, x2=0, y2=0, r2=1):
      x = (x2 - x1) ** 2
      y = (y2 - y1) ** 2
      distance = sqrt(x + y)
      if (r1 + r2 == distance or abs(r1 - r2) == distance
          ) and distance <= r1 + r2 - 1:
          return True
      else:
          return False