Fastapi Tutorial Pdf Jun 2026

from fastapi import Depends, HTTPException from sqlalchemy.orm import Session from .database import engine, get_db from .models import DBProduct, Base # Create tables on startup Base.metadata.create_all(bind=engine) @app.get("/db-products/product_id") def fetch_product(product_id: int, db: Session = Depends(get_db)): product = db.query(DBProduct).filter(DBProduct.id == product_id).first() if not product: raise HTTPException(status_code=404, detail="Product not found") return "id": product.id, "title": product.title, "cost": product.cost Use code with caution. Dependency Injection System

mkdir fastapi-app cd fastapi-app python -m venv venv source venv/bin/activate # On Windows: venv\Scripts\activate pip install fastapi uvicorn Use code with caution. 2. Your First FastAPI Application Create a file named main.py and add the following code: fastapi tutorial pdf

If you are reading this on GitHub or a blog, tools like Pandoc can convert Markdown documentation into professionally formatted PDF files. from fastapi import Depends, HTTPException from sqlalchemy

If you visit /users/1?details=true , FastAPI parses true into Python's boolean True . 6. Request Body and Data Handling with Pydantic Your First FastAPI Application Create a file named main

Paid platforms (Udemy, Coursera, TestDriven.io) often provide downloadable PDFs of their course slides or transcripts. If you purchase a FastAPI course, check the "Resources" tab for a companion PDF.

from pydantic import BaseModel, Field, EmailStr class InventoryItem(BaseModel): name: str = Field(..., min_length=2, max_length=50) price: float = Field(..., gt=0.0, description="The price must be greater than zero") quantity: int = Field(default=0, ge=0) sku: str @app.post("/items", status_code=21) def create_item(item: InventoryItem): # The 'item' argument is fully validated and parsed as a Pydantic object item_dict = item.model_dump() return "message": "Item created successfully", "data": item_dict Use code with caution. Database Integration using SQLAlchemy

--reload : Restarts the server automatically when code changes. Testing the API Open your browser and navigate to http://127.0.0 . You will see: "Hello": "World" .