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range extraction
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| from itertools import groupby | |
| def solution(args): | |
| # [-3,-2,-1,2,10,15,16,18,19,20] -> [[-3, -2, -1], [2], [10], [15, 16], [18, 19, 20]] | |
| grps = ([v[1] for v in g] for _,g in groupby(enumerate(args), lambda p: p[1]-p[0])) | |
| #[[-3, -2, -1], [2], [10], [15, 16], [18, 19, 20]] -> -3--1,2,10,15,16,18-20 | |
| return ','.join('{}{}{}'.format(g[0],'-'if len(g)>2 else',',g[-1]) | |
| if len(g)>1 else str(g[0]) for g in grps) |
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