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