Update app.py

app.py

@@ -12,7 +12,7 @@ from langchain_openai import ChatOpenAI
 from langchain.agents import AgentExecutor, create_react_agent
 from langchain.memory import ConversationSummaryMemory
 from langchain.tools import Tool
-from langchain_experimental.utilities import PythonREPL
+from langchain.tools.python.tool import PythonREPLTool
 from langchain_community.document_loaders import WikipediaLoader
 from langchain.prompts import PromptTemplate
 
@@ -20,11 +20,9 @@ from langchain.prompts import PromptTemplate
 DEFAULT_API_URL = "https://agents-course-unit4-scoring.hf.space"
 
 # === TOOL: python_repl ===
-python_repl = PythonREPL()
-repl_tool = Tool(
+repl_tool = PythonREPLTool(
     name="python_repl",
-    description="A Python REPL (Read-Eval-Print Loop) for calculations, parsing, and data manipulation. Input must be valid Python. Use print() to output your answer.",
-    func=python_repl.run,
+    description="A Python REPL for calculations and parsing. Input must be valid Python code, use print() to output results."
 )
 
 # === TOOL: file_saver ===