>>> cProfile.run("list(lr.rank_lyst_feed(6652, limit=20))")
         1684 function calls in 0.043 CPU seconds

   Ordered by: standard name

   ncalls  tottime  percall  cumtime  percall filename:lineno(function)
        1    0.000    0.000    0.043    0.043 <string>:1(<module>)
      547    0.001    0.000    0.001    0.000 datastructures.py:37(__getitem__)
       21    0.040    0.002    0.043    0.002 rankoo.py:145(rank_lyst_feed)
       20    0.000    0.000    0.000    0.000 {method 'add' of 'set' objects}
      546    0.000    0.000    0.000    0.000 {method 'append' of 'list' objects}
        1    0.000    0.000    0.000    0.000 {method 'disable' of '_lsprof.Profiler' objects}
      546    0.001    0.000    0.001    0.000 {ranking.rankopt.score}
        1    0.000    0.000    0.000    0.000 {sorted}
        1    0.000    0.000    0.000    0.000 {time.time}