models.py 文件源码

def GetPriceByPredictionId(prediction_id):
  """Get current price by Prediction Id"""
  prediction_key = ndb.Key(urlsafe=prediction_id)
  pred = prediction_key.get()
  price = math.pow(math.e, (pred.contract_one / pred.liquidity)) / (
      math.pow(math.e, (pred.contract_two / pred.liquidity)) + math.pow(
          math.e, (pred.contract_two / pred.liquidity)))
  return float(price)