呼び出し可能型(lambda式含む)の型指定

pyBTrade.py

# 呼び出し可能オブジェクト:func
# 引数1:int
# 引数2:float
# 返り値:str

def test(func: Callable[[int, float], str]) -> None:

詳しくは公式ドキュメントを参照
https://docs.python.org/ja/3/library/typing.html#typing.Callable

自分とこの実装例

pyBTrade.py

    async def order_limit(
        self, 
        price: Decimal, 
        size: Decimal, 
        func: Callable[['TradeSim', COrderItem], bool] = None
    ) -> COrderItem:
        order: COrderItem = self.book_keeper_fx.order_limit(price, size)
        while True:
            try:
                await asyncio.sleep(0)
                if order.is_finished:
                    break
                if self.is_finished:
                    break
                if callable(func):
                    if func(self, order):
                        raise asyncio.CancelledError
            except asyncio.CancelledError:
                await self.send_order_cancel(order)
                break
        return order