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Update specs/core/0_beacon-chain.md 

Co-Authored-By: djrtwo <dannyjryan@gmail.com>
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Hsiao-Wei Wang 2019-04-14 22:12:39 +10:00 committed by GitHub
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specs/core/0_beacon-chain.md
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@ -691,6 +691,7 @@ def slot_to_epoch(slot: Slot) -> Epoch:
def get_previous_epoch(state: BeaconState) -> Epoch:
"""`
Return the previous epoch of the given ``state``.
Return the current epoch if it's genesis epoch.
"""
current_epoch = get_current_epoch(state)
return (current_epoch - 1) if current_epoch > GENESIS_EPOCH else current_epoch