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# Go over weeks to fill history and calculate what the current point is
t_i: uint256 = (last_checkpoint / WEEK) * WEEK
for i in range(255):
    # Hopefully it won't happen that this won't get used in 5 years!
    # If it does, users will be able to withdraw but vote weight will be broken
    t_i += WEEK
    d_slope: int128 = 0
    if t_i > block.timestamp:
        t_i = block.timestamp
    else:

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last_point: Point = Point({bias: 0, slope: 0, ts: block.timestamp, blk: block.number})
if _epoch > 0:
    last_point = self.point_history[_epoch]
// 중략

if addr != ZERO_ADDRESS:	
	last_point.slope += (u_new.slope - u_old.slope)
	last_point.bias += (u_new.bias - u_old.bias)
	if last_point.slope < 0:
	    last_point.slope = 0

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_epoch: uint256 = self.user_point_epoch[addr]
if _epoch == 0:
    return 0
else:
    last_point: Point = self.user_point_history[addr][_epoch]
    last_point.bias -= last_point.slope * convert(_t - last_point.ts, int128)
    if last_point.bias < 0:
        last_point.bias = 0
    return convert(last_point.bias, uint256)

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if new_locked.end > block.timestamp and new_locked.amount > 0:
    u_new.slope = new_locked.amount / MAXTIME
    u_new.bias = u_new.slope * convert(new_locked.end - block.timestamp, int128)

// 중략
self.user_point_epoch[addr] = user_epoch
u_new.ts = block.timestamp
u_new.blk = block.number
self.user_point_history[addr][user_epoch] = u_new

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	if new_locked.end > block.timestamp and new_locked.amount > 0:
      u_new.slope = new_locked.amount / MAXTIME
      u_new.bias = u_new.slope * convert(new_locked.end - block.timestamp, int128)

	// 중략
	self.user_point_epoch[addr] = user_epoch
  u_new.ts = block.timestamp
  u_new.blk = block.number
  self.user_point_history[addr][user_epoch] = u_new