feat: in memory ptf

auto_trading/interfaces.py

@@ -20,7 +20,7 @@ class Portfolio(ABC):
         """Deposit money into the portfolio"""
 
     @abstractmethod
-    def convert(self, amount: int, currency: str, to_currency: str) -> None:
+    def convert(self, amount: int, to_amount: int, currency: str, to_currency: str) -> None:
         """Convert money from one currency to another"""
 
 

auto_trading/ptf/in_memory.py

@@ -0,0 +1,28 @@
+from ..interfaces import Portfolio
+
+
+class InMemoryPortfolio(Portfolio):
+    """Just store the value in memory."""
+    
+    def __init__(self, currency: dict) -> None:
+        """Define the ptf with some starting currency"""
+        self.currency = currency
+
+    def content(self) -> dict:
+        """return the content in each currency"""
+        return self.currency
+
+    def widraw(self, amount: int, currency: str) -> None:
+        """Withdraw money from the portfolio"""
+        if self.currency[currency] < amount:
+            raise ValueError("Not enough money")
+        self.currency[currency] -= amount
+
+    def deposit(self, amount: int, currency: str) -> None:
+        """Deposit money into the portfolio"""
+        self.currency[currency] += amount
+
+    def convert(self, amount: int, to_amount: int, currency: str, to_currency: str) -> None:
+        """Convert money from one currency to another"""
+        self.widraw(amount, currency)
+        self.deposit(to_amount, to_currency)