Introduction

Core entry point of the Python app (backend):

• Initialize app
• Managing app lifecycle (startup & shutdown)
• Running the simulation engine
• Starting the AI agent loop (background task)
• Handling real-time communication (WebSocket)
• Registering API routes
• Managing global error handling

Types of main.py

1. CLI App

• Simple Script

print("Hello World")

2. Backend Server

• Entry point for web applications

app = FastAPI()