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 {"message": "Hello world!"}
  18 EOF
  19 
  20 fastapi dev main.py
  21 # /home/vitor/Documents/fastapi-test/.venv/bin/python3 \
  22 #  /home/vitor/Documents/fastapi-test/.venv/bin/fastapi dev main.py
  23 # http://127.0.0.1:8000
  24 # Server started at http://127.0.0.1:8000
  25 # OpenAPI/Swagger documentation at http://127.0.0.1:8000/docs
  26 
  27 
  28 uvicorn main:app --reload