Update app.py

app.py

@@ -1,4 +1,4 @@
-from smolagents import CodeAgent, tool, OpenAIServerModel, FinalAnswerTool
+from smolagents import CodeAgent, tool, OpenAIServerModel, FinalAnswerTool,ToolCallingAgent
 import datetime
 import pytz
 import yfinance as yf
@@ -19,7 +19,7 @@ def get_currency_rate(currency_pair: str) -> str:
         # Use yfinance to get the exchange rate
         ticker = f"{base}{target}=X"  # Format for yfinance (e.g., "USDEUR=X")
         data = yf.Ticker(ticker)
-        rate = data.history(period="1d")["Close"].iloc[-1]
+        rate = data.history(period="1d")["Close"].iloc[-1].astype(str)
         return f"Current {currency_pair} rate: {rate}"
     except Exception as e:
         return f"Error fetching rate: {str(e)}"
@@ -52,7 +52,7 @@ currency_tool = get_currency_rate
 time_tool = get_current_time_in_timezone
 
 # Create the agent
-agent = CodeAgent(
+agent = ToolCallingAgent(
     model=model,
     tools=[currency_tool, final_answer],
     max_steps=3,