def get_mode_trade_size(self, side: OrderSide, order_type: OrderType, seconds_ago: int,
group_by_period: Optional[int] = None) -> Optional[float]:
order_quantities = self.get_trade_quantities(side, order_type, seconds_ago, group_by_period)
if len(order_quantities) == 0:
return None
try:
return mode(order_quantities)
except StatisticsError:
return None
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