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 mkdir static templates
   5 python3 -m venv .venv
   6 source .venv/bin/activate
   7 
   8 cat << 'EOF' > requirements.txt
   9 fastapi[standard]
  10 pyyaml
  11 jinja2 
  12 
  13 EOF
  14 
  15 pip install -r requirements.txt 
  16 
  17 
  18 cat << 'EOF' > templates/index.html
  19 <!DOCTYPE html>
  20 <html lang="pt">
  21 <head>
  22     <meta charset="UTF-8">
  23     <title>{{ titulo }}</title>
  24 </head>
  25 <body>
  26     <h1>{{ mensagem }}</h1>
  27     <p>Este é o lado <strong>Web Server</strong> do FastAPI.</p>
  28     <p>Experimenta os outros caminhos:</p>
  29     <ul>
  30         <li>Aceder à API: <a href="/api/v1/items">/api/v1/items</a></li>
  31         <li>Ver documentação interativa: <a href="/docs">/docs</a></li>
  32         <li>Descarregar Contrato OpenAPI YAML: <a href="/openapi.yaml">/openapi.yaml</a></li>
  33     </ul>
  34 </body>
  35 </html>
  36 EOF
  37 
  38 
  39 
  40 cat << 'EOF' > main.py
  41 import yaml
  42 from fastapi import FastAPI
  43 from fastapi.responses import Response
  44 
  45 app = FastAPI()
  46 
  47 @app.get("/")
  48 def read_root():
  49     return {"message": "Hello world!"}
  50 
  51 @app.get("/openapi.yaml", include_in_schema=False)
  52 def get_openapi_yaml():
  53     openapi_json = app.openapi()
  54     openapi_yaml = yaml.dump(openapi_json, sort_keys=False)
  55     return Response(content=openapi_yaml, media_type="text/yaml")
  56 
  57 EOF
  58 
  59 fastapi dev main.py
  60 # /home/vitor/Documents/fastapi-test/.venv/bin/python3 \
  61 #  /home/vitor/Documents/fastapi-test/.venv/bin/fastapi dev main.py
  62 # http://127.0.0.1:8000
  63 # Server started at http://127.0.0.1:8000
  64 # OpenAPI/Swagger documentation at http://127.0.0.1:8000/docs
  65 # http://127.0.0.1:8000/openapi.yaml
  66 # http://127.0.0.1:8000/openapi.json
  67 
  68 uvicorn main:app --reload

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FastAPI

main.py

pip , venv steps