feat: solution for 'Повторный экзамен: Граф с рефлексией и доработкой'

src/utils.py

@@ -0,0 +1,22 @@
+"""
+Utility functions for the LangGraph project.
+"""
+
+from langchain_openai import ChatOpenAI
+from typing import Dict, Any
+
+def get_llm() -> ChatOpenAI:
+    """
+    Returns a configured OpenAI LLM instance.
+    """
+    # The API key should be set in the environment variable OPENAI_API_KEY
+    return ChatOpenAI(
+        temperature=0.7,
+        model_name="gpt-3.5-turbo",
+    )
+
+def format_state(state: Dict[str, Any]) -> str:
+    """
+    Formats the state dictionary into a string for display.
+    """
+    return "\n".join(f"{k}: {v}" for k, v in state.items())