Fastapi Tutorial Pdf Verified -

FastAPI automatically hosts interactive documentation at the following endpoints:

@app.get("/items/item_id") def read_item(item_id: int): return "item_id": item_id Use code with caution.

from fastapi.testclient import TestClient from main import app

: Connect to a database like PostgreSQL or SQLite using SQLAlchemy to save your posts permanently. fastapi tutorial pdf

: Navigate to http://127.0.0 to interactively test your API endpoints directly from your browser.

from fastapi.security import OAuth2PasswordBearer, OAuth2PasswordRequestForm from jose import jwt from passlib.context import CryptContext SECRET_KEY = "your-secret-key" ALGORITHM = "HS256" pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto") oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token") def hash_password(password: str): return pwd_context.hash(password) @app.post("/token") def login(form_data: OAuth2PasswordRequestForm = Depends()): # In production, verify credentials against your database if form_data.username == "admin" and form_data.password == "secret": token = jwt.encode("sub": form_data.username, SECRET_KEY, algorithm=ALGORITHM) return "access_token": token, "token_type": "bearer" raise HTTPException(status_code=400, detail="Incorrect username or password") Use code with caution. 9. Error Handling and Validation

from pydantic import BaseModel

First, create a directory for your project and navigate into it: mkdir fastapi-projectcd fastapi-project Next, create and activate a virtual environment:

FastAPI is the future of Python web development. Whether you study via a printed manual, a digital PDF, or a live server, the most important step is to write your first endpoint today.

Run: pytest -v

@app.post("/notify/") def notify(email: str, background_tasks: BackgroundTasks): background_tasks.add_task(send_email, email, "Welcome!") return "message": "Notification sent in background"

Standards-based: Fully compatible with OpenAPI and JSON Schema. Setting Up Your Environment

FastAPI leverages Python type hints to validate incoming request data automatically. Path Parameters from fastapi

pip install mkdocs-material mkdocs-exclude

Create a file named main.py and add the following code to build a basic health-check endpoint.