为什么数字不加单引号,加了之后为什么不对
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 : print x*10+y
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 : print x*10+y
2019-05-01
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