壹個python的編程題，求各位大神幫幫忙，不要用太難的語句，最簡單的方法就行了

print?'I?guess?'+str(gnum)

return?input('Am?I?too?high(1),too?low(2),or?right?on?(3)\n')

def?playGame():

startnum=1

endnum=1000

midnum=(startnum+endnum)/2

ch=menu(midnum)

while?ch!=3?and?startnum<endnum:

if?ch==1:

endnum=midnum

elif?ch==2:

startnum=midnum

midnum=(startnum+endnum)/2

ch=menu(midnum)

if?ch==3:

print?'I?got?it!'

else:

print?'Error!'

if?__name__=='__main__':

playGame()