请教打印后的为啥是?
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: sum=x*10+y print sum 19,29,39,49,59,69,79,89,89这是为啥啊
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: sum=x*10+y print sum 19,29,39,49,59,69,79,89,89这是为啥啊
2017-12-15
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