Fastapi Tutorial Pdf -

If you go to /items/42 , the response is "item_id": 42 . FastAPI automatically parses item_id as an integer.

The --reload flag instructs Uvicorn to restart the server automatically whenever you save changes to your code. Handling Path and Query Parameters

For production, use Gunicorn as a process manager: fastapi tutorial pdf

from fastapi import FastAPI app = FastAPI( title="Inventory Management API", description="A production-ready API for managing warehouse stock.", version="1.0.0" ) @app.get("/") def read_root(): return "status": "operational", "message": "Welcome to the Inventory API" Use code with caution.

from typing import Optional from fastapi import FastAPI from pydantic import BaseModel, Field app = FastAPI() # Define the Pydantic schema class Item(BaseModel): name: str = Field(..., example="Wireless Mouse") description: Optional[str] = Field(None, max_length=300) price: float = Field(..., gt=0, description="The price must be greater than zero") tax: Optional[float] = None @app.post("/items/") def create_item(item: Item): # The data is already validated here item_dict = item.dict() if item.tax: price_with_tax = item.price + item.tax item_dict.update("price_with_tax": price_with_tax) return item_dict Use code with caution. 6. Response Models and Status Codes If you go to /items/42 , the response is "item_id": 42

from fastapi import FastAPI app = FastAPI() @app.get("/") def read_root(): return "message": "Welcome to your first FastAPI application!" @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 the local development server using Uvicorn: uvicorn main:app --reload Use code with caution.

If a user visits /users/foo , FastAPI will automatically return a 422 Unprocessable Entity error because foo is not an integer. Query Parameters Handling Path and Query Parameters For production, use

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