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 cd ~/Documents
   2 mkdir -p fastapi-test
   3 cd fastapi-test
   4 python3 -m venv .venv
   5 source .venv/bin/activate
   6 echo "fastapi[standard]" > requirements.txt 
   7 
   8 pip install -r requirements.txt 
   9 
  10 cat << 'EOF' > main.py
  11 from fastapi import FastAPI
  12 
  13 app = FastAPI()
  14 
  15 @app.get("/")
  16 def read_root():
  17     return {"mensagem": "Olá, Mundo! Criado via terminal!"}
  18 EOF
  19 
  20 fastapi dev main.py
  21 # http://127.0.0.1:8000
  22 # Server started at http://127.0.0.1:8000
  23 # Documentation at http://127.0.0.1:8000/docs
  24 
  25 
  26 uvicorn main:app --reload