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Remove another unnecessary list materialization

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Alex Stokes 2019-07-10 17:05:49 -07:00
parent b80d6e0495
commit 4def681a4e
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1 changed files with 2 additions and 2 deletions
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specs/core/0_beacon-chain.md
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@ -1284,10 +1284,10 @@ def get_winning_crosslink_and_attesting_indices(state: BeaconState,
epoch: Epoch,
shard: Shard) -> Tuple[Crosslink, Set[ValidatorIndex]]:
attestations = [a for a in get_matching_source_attestations(state, epoch) if a.data.crosslink.shard == shard]
crosslinks = list(filter(
crosslinks = filter(
lambda c: hash_tree_root(state.current_crosslinks[shard]) in (c.parent_root, hash_tree_root(c)),
[a.data.crosslink for a in attestations]
))
)
# Winning crosslink has the crosslink data root with the most balance voting for it (ties broken lexicographically)
winning_crosslink = max(crosslinks, key=lambda c: (
get_attesting_balance(state, [a for a in attestations if a.data.crosslink == c]), c.data_root