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Added a note for underflow. Thanks Hsiao Wei! : ) 

Co-Authored-By: terenc3t <terence@prysmaticlabs.com>
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Hsiao-Wei Wang 2019-02-03 14:27:09 +01:00 committed by GitHub
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specs/core/0_beacon-chain.md
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@ -646,6 +646,7 @@ def slot_to_epoch(slot: SlotNumber) -> EpochNumber:
def get_previous_epoch(state: BeaconState) -> EpochNumber: def get_previous_epoch(state: BeaconState) -> EpochNumber:
"""` """`
Return the previous epoch of the given ``state``. Return the previous epoch of the given ``state``.
If the current epoch is ``GENESIS_EPOCH``, return ``GENESIS_EPOCH``.
""" """
if slot_to_epoch(state.slot) > GENESIS_EPOCH: if slot_to_epoch(state.slot) > GENESIS_EPOCH:
return slot_to_epoch(state.slot) - 1 return slot_to_epoch(state.slot) - 1