FastAPI

https://fastapi.tiangolo.com/

FastAPI is a modern, fast (high-performance), web framework for building APIs with Python based on standard Python type hints.

FastAPI works OK without uv. You can build, install, and run FastAPI projects using traditional tools like pip, venv, and poetry

main.py

Install

   1 # uv An extremely fast Python package and project manager, written in Rust.
   2 # https://docs.astral.sh/uv/getting-started/installation/
   3 curl -LsSf https://astral.sh/uv/install.sh | sh
   4 pipx install uv
   5 pip install uv
   6 uv self update
   7 pip install --upgrade uv
   8 
   9 uv add "fastapi[standard]"
  10 
  11 pip install fastapi[standard]
  12 # Virtual Environment: Python's built-in venv module
  13 # Dependency Management: requirements.txt or pyproject.toml
  14

   1 from fastapi import FastAPI
   2 
   3 app = FastAPI()
   4 
   5 @app.get("/")
   6 def read_root():
   7     return {"Hello": "World"}
   8 
   9 @app.get("/items/{item_id}")
  10 def read_item(item_id: int, q: str | None = None):
  11     return {"item_id": item_id, "q": q}

Run

uv run fastapi dev

pip , venv steps

   1 python3 -m venv .venv
   2 source .venv/bin/activate
   3 echo "fastapi[standard]" > requirements.txt 
   4 
   5 cat << 'EOF' > main.py
   6 from fastapi import FastAPI
   7 
   8 app = FastAPI()
   9 
  10 @app.get("/")
  11 def read_root():
  12     return {"mensagem": "Olá, Mundo! Criado via terminal!"}
  13 EOF
  14 
  15 fastapi dev main.py
  16 # http://127.0.0.1:8000
  17 uvicorn main:app --reload