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