Fastapi Tutorial Pdf | Ultimate • 2025 |

FastAPI has a powerful Dependency Injection system. This allows you to share logic, enforce security, or handle database connections easily. from fastapi import Depends

First, create a directory for your project and navigate into it: mkdir fastapi-projectcd fastapi-project Next, create and activate a virtual environment: fastapi tutorial pdf

In the example above, we saw both path and query parameters. FastAPI has a powerful Dependency Injection system

@app.get("/items/{item_id}")def read_item(item_id: int, q: str = None):return {"item_id": item_id, "q": q} To run the application, use the following command: uvicorn main:app --reload q: str = None):return {"item_id": item_id