sweet dubs

>>11,22,33,44,55,66,77,88,99,100,111,122,133,144,155,166,177,188,199,200,211,222,233,244,255,266,277,288,299,300,311,322,333,344,355,366,377,388,399,400,411,422,433,444,455,466,477,488,499,500,511,522,533,544,555,566,577,588,599,600,611,622,633,644,655,666,677,688,699,700,711,722,733,744,755,766,777,788,799,800,811,822,833,844,855,866,877,888,899,900,911,922,933,944,955,966,977,988,999,1000

sweet dubs

'>>' + ','.join(map(str, filter(lambda x: x%10 == (x//10)%10, range(1,1001))))

>>3
Slightly obfuscated Python 3 (or unnecessarily explicit Python 2).

How a non-retard (and non-LISPer) would write it:

'>>' + ','.join(str(x) for x in range(1, 1001) if x % 10 == x % 100 // 10)