FastAPI 소개 및 설정

FastAPI is a modern, high-speed Python web framework for building APIs. It leans on standard type hints, so you ship robust services fast.

FastAPI wins on speed and DX: built on Starlette and Pydantic, it codes fast, catches bugs early via type hints, and auto-generates interactive docs.

FastAPI needs Python 3.7+ and pip. Check your version with python3 --version before you go further.

Always work inside a virtual environment — an isolated package space per project so different versions never collide. Think clean workspace.

Create your virtual environment with python3 -m venv .venv, then activate it. You will see (.venv) in your prompt when it is live.

Install the framework and its server: pip install fastapi "uvicorn[standard]". Uvicorn is the ASGI server that actually runs your async app.

Drop this into main.py — a tiny FastAPI app with one root route that returns JSON.

Run it with uvicorn main:app --reload. That points Uvicorn at your app object and auto-restarts on every save. It serves on 127.0.0.1:8000.

FastAPI builds interactive docs for free — Swagger UI at /docs, ReDoc at /redoc. Explore and test your endpoints right in the browser.

You've learned about setting up FastAPI. Which of the following are TRUE statements about getting started with FastAPI?

Nice work! You set up FastAPI, used a venv, wrote your first endpoint, ran it with Uvicorn, and met the auto-generated docs. Next: building real routes.