func_code: def overlap(x1=0, y1=0, r1=1, x2=0, y2=0, r2=1):
      A = False
      sumrad = r1 + r2
      xs = (x2 - x1) ** 2
      ys = (y2 - y1) ** 2
      inside = xs + ys
      dis = math.sqrt(inside)
      if dis < sumrad:
          return True
      elif sumrad < dis:
          return A
      elif sumrad == dis:
          return A