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 
   7 cat << 'EOF' > requirements.txt
   8 fastapi[standard]
   9 pyyaml
  10 jinja2 
  11 
  12 EOF
  13 
  14 pip install -r requirements.txt 
  15 
  16 cat << 'EOF' > main.py
  17 import yaml
  18 from fastapi import FastAPI
  19 from fastapi.responses import Response
  20 
  21 app = FastAPI()
  22 
  23 @app.get("/")
  24 def read_root():
  25     return {"message": "Hello world!"}
  26 
  27 @app.get("/openapi.yaml", include_in_schema=False)
  28 def get_openapi_yaml():
  29     openapi_json = app.openapi()
  30     openapi_yaml = yaml.dump(openapi_json, sort_keys=False)
  31     return Response(content=openapi_yaml, media_type="text/yaml")
  32 
  33 EOF
  34 
  35 fastapi dev main.py
  36 # /home/vitor/Documents/fastapi-test/.venv/bin/python3 \
  37 #  /home/vitor/Documents/fastapi-test/.venv/bin/fastapi dev main.py
  38 # http://127.0.0.1:8000
  39 # Server started at http://127.0.0.1:8000
  40 # OpenAPI/Swagger documentation at http://127.0.0.1:8000/docs
  41 # http://127.0.0.1:8000/openapi.yaml
  42 # http://127.0.0.1:8000/openapi.json
  43 
  44 uvicorn main:app --reload