Just as a matter of curiosity piqued by having to understand someone else's code. Is the difference here just a matter of style, or is one better somehow than the other? >>> l [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10] >>> ','.join([str(x) for x in l]) '0,1,2,3,4,5,6,7,8,9,10' >>> ','.join(map(lambda x:str(x), l)) '0,1,2,3,4,5,6,7,8,9,10'