为什么加个单引号,结果就完全不一样呢???
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 10 * x + 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 10 * x + y
2016-12-22
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