最后的输出为什么可以表示一个两位数
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+y
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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+y
2017-07-09
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