li = [1, 5, 6, 7, 12, 22, 33, 44, 55, 66, 77, 88, 99, 111, 222, 333]
def er(num,li):
    if len(li) ==0:
        print ('没有找到')
        return num
    WZ=len(li)//2
    if num == li[WZ]:
        print (num,'就是你要找的')
    elif num > li[WZ]:
        print ('小了')
        li=li[WZ+1:]
        return er(num,li)
    elif num < li[WZ]:
        print('大了')
        li=li[:WZ]
        return er(num, li)
er(23,li)