for x in [1,2,3,4,5,6,7,8,9]:

? ? for y in [ 1,2,3,4,5,6,7,8,9]:

? ? ? ? if x<y:

? ? ? ? ? ? print (x*10+y)

感覺這么一波很簡潔

for?x?in[1,2,3,4,5,6,7,8,9]:
????for?y?in[0,1,2,3,4,5,6,7,8,9]:
??????if?x>=y:
?????????continue
??????print?(x*10+y)

python 對控制語句模塊縮進有要求，要4個空格，格式見上面代碼