début spread

auto_trading/orders.py

@@ -3,14 +3,14 @@ from dataclasses import dataclass
 
 from .interfaces import Order
 
-
 @dataclass
 class Long(Order):
     """Buy stock."""
 
     stock: str
     amount: float
-    price: float
+    price:float
+
 
     @property
     def amount_usd(self) -> float:

auto_trading/ptf/in_memory.py

@@ -43,12 +43,14 @@ class InMemoryPortfolio(PTF):
 
     def execute_long(self, order: Long) -> None:
         """Buy actions."""
-        if self.balance < order.amount * order.price:
+        SPREAD=1.0001
+        PRICE = order.price * SPREAD
+        if self.balance < order.amount * PRICE:
             raise OrderFails("Not enough money.")
-        if self.change_rate.get(order.stock, 0) > order.price:
+        if self.change_rate.get(order.stock, 0) > PRICE:
             raise OrderFails("You buy it too low.")
 
-        self._balance -= order.price * order.amount
+        self._balance -= PRICE * order.amount
         self._stocks[order.stock] = order.amount + self._stocks.get(order.stock, 0)
 
     executors = {Short: execute_short, Long: execute_long}

main.py

@@ -15,7 +15,7 @@ if __name__ == "__main__":
     )
 
     #strategy = Hold("GOOGL", {"dumb": Dumb(bt.data.close)})
-    strategy = BuyUpSellDown("GOOGL", {"slopy": Slopy()})
+    strategy = BuyUpSellDown("GOOG", {"slopy": Slopy()})
 
     bot = Bot(ptf, strategy, bt)