class range(object)
| range(stop) -> range object range(start, stop[, step]) -> range object
| Return an object that produces a sequence of integers from start (inclusive)
| to stop (exclusive) by step. range(i, j) produces i, i+1, i+2, ..., j-1.
#按照要求来
print [x*100 + y*10 + z for x in range(1,10) for y in range(0,10)
for z in range(1,10) if x==z]
#print [x for x in range(100,1000) if x/100 ==x%10]
