Fastapi Tutorial Pdf

Install: pip install python-jose[cryptography] passlib[bcrypt]

Hash password:

from passlib.context import CryptContext
pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
def verify_password(plain, hashed):
return pwd_context.verify(plain, hashed)
def get_password_hash(password):
return pwd_context.hash(password)

Create JWT token:

from jose import JWTError, jwt
def create_access_token(data: dict):
to_encode = data.copy()
expire = datetime.utcnow() + timedelta(minutes=30)
to_encode.update("exp": expire)
return jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
 fastapi tutorial pdf

Protected route:

@app.get("/users/me/")
def read_users_me(current_user: User = Depends(get_current_user)):
    return current_user

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is a high-performance Python web framework designed for building modern APIs with standard Python type hints

. Below is a comprehensive guide to mastering its core features, including environment setup, CRUD operations, and advanced data validation. 1. Getting Started & Installation

To begin, set up a virtual environment and install the required dependencies: for the framework and as the ASGI server. pip install fastapi uvicorn Basic App: Create a file (e.g., ) and define your first endpoint: = FastAPI()

@app.get( Use code with caution. Copied to clipboard uvicorn main:app --reload to start a development server with live-reloading. 2. Path and Query Parameters

FastAPI uses standard Python types for automatic data conversion and validation. Path Parameters: Define dynamic values in the URL path (e.g., /user_id Query Parameters: Create JWT token: from jose import JWTError, jwt

Declare function arguments that aren't part of the path to automatically handle query strings (e.g., 3. Request Body & Pydantic Models Getting Started with Python and FastAPI - PyImageSearch

from pydantic import BaseModel
class Item(BaseModel):
name: str
price: float
is_offer: bool = None
@app.post("/items/")
async def create_item(item: Item):
return "item_name": item.name, "item_price": item.price

Download the Official Documentation PDF.

FastAPI provides built-in support for testing using Pytest. Here's an example:

from fastapi.testclient import TestClient
from main import app
client = TestClient(app)
def test_read_root():
    response = client.get("/")
    assert response.status_code == 200
    assert response.json() == "Hello": "World"

In this example, we define a test that checks the response of the root URL. Protected route: @app

On the first page of your PDF, paste a QR code that links to the live https://fastapi.tiangolo.com/docs/. This bridges the gap: read the theory offline, but paste the code into your IDE when online.