python 跳出多重循环

class Getoutforloop(Exception):
    pass

if __name__ == '__main__':
    try:
        for i in range(10):
            for j in range(10):
                if i==5 and j==4:
                    raise Getoutforloop()
                else:
                    print('i=={},j=={}'.format(i,j))
    except Getoutforloop:
        pass
    print("ok")