Pdf — Fastapi Tutorial

In this example, we define a route that raises an HTTPException if the user_id is invalid.

If you are looking to learn more about setting up your API structure, I can provide a more in-depth guide on structuring your . Would that be helpful?

Visit http://127.0.0.1:8000 . You’ll see the JSON response. Now visit http://127.0.0.1:8000/docs – a fully interactive Swagger UI appears automatically.

FastAPI is a modern, fast (high-performance), web framework for building APIs with Python 3.8+ based on standard Python type hints. Key Features fastapi tutorial pdf

You can add extra constraints and metadata to your path and query parameters using FastAPI's Path and Query functions.

Two advanced features that set FastAPI apart.

@app.get("/users/user_id") def get_user(user_id: int): return "user_id": user_id Use code with caution. In this example, we define a route that

FROM python:3.10-slim WORKDIR /app COPY ./requirements.txt /app/requirements.txt RUN pip install --no-cache-dir --upgrade -r /app/requirements.txt COPY ./app /app/app CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "80"] Use code with caution. Save This Guide as a PDF

To start with FastAPI, you'll need to install it using pip:

To save this tutorial as a PDF, you can use your browser's "Print" function (Ctrl+P or Cmd+P) and select "Save as PDF" as the destination. This will allow you to keep this guide as a handy reference for your future FastAPI projects. Visit http://127

from sqlalchemy import create_engine from sqlalchemy.orm import declarative_base, sessionmaker SQLALCHEMY_DATABASE_URL = "sqlite:///./sql_app.db" engine = create_engine( SQLALCHEMY_DATABASE_URL, connect_args="check_same_thread": False ) SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine) Base = declarative_base() # Dependency to yield database sessions per request def get_db(): db = SessionLocal() try: yield db finally: db.close() Use code with caution. 2. SQL Alchemy Models ( models.py )

from fastapi import FastAPI # Initialize the FastAPI application app = FastAPI( title="FastAPI PDF Tutorial API", description="A sample API built for our comprehensive FastAPI guide.", version="1.0.0" ) @app.get("/") def read_root(): return "message": "Welcome to the FastAPI Tutorial!" @app.get("/items/item_id") def read_item(item_id: int, q: str = None): return "item_id": item_id, "query": q Use code with caution. Running the Application Start your development server by running: fastapi dev main.py Use code with caution. (Alternatively, you can use: uvicorn main:app --reload )

Any FastAPI tutorial PDF worth its salt will dedicate a full chapter to Pydantic.