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Load a snapshot from a file. rbN)rrload)rYrs rrz Snapshot.loads (D ! ! #R;r?? # # # # # # # # # # # # # # # # # #s 266c|rtfd|DsdS|rtfd|DrdSdS)Nc3BK|]}|VdSrrr} trace_filterr~s rrz)Snapshot._filter_trace..sE<<'$**511<<<<<.sH88#$**5111888888rT)r)rinclude_filtersexclude_filtersr~s `r _filter_tracezSnapshot._filter_traces  <<<<+:<<<<< u  8888'688888 utrct|ts$tdt|jz|rVgg|D]4}|jr||5fdjjD}njj }t|j S)z Create a new Snapshot instance with a filtered traces sequence, filters is a list of Filter or DomainFilter instances. 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D3E  E (E88FFFc|||}t|}|dtj|S)zd Group statistics by key_type. Return a sorted list of Statistic instances. Treversekey)r listvaluessortrr3)rrrgroupedrMs rrMzSnapshot.statisticssM ..:66'..**++ )*=>>>rc|||}|||}t||}|dtj|S)z Compute the differences with an old snapshot old_snapshot. Get statistics as a sorted list of StatisticDiff instances, grouped by group_by. 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