from fastapi import FastAPI

app = FastAPI()
@app.get("/")
def get_product():
return "Hello World"
From this code the third line is a FastAPI path operation decorator.
when we run the command : uvicorn main:app --reload
it displays like this

if you observe the address bar after the ip address there is “/” and in the above code line number three we can observer this ("/") yes, these are related and knowns as path.
A URL is used by the client to locate and access a particular resource or API endpoint on the server. In FastAPI, the URL path is mapped to a path operation, such as a function, which handles the client's request.

FastAPI matches GET + / to get_product() and returns "Hello World".

from fastapi import FastAPI

from pydantic import BaseModel

app = FastAPI()

class product(BaseModel):

id: int

name: str

description: str

price: float

quantity: int

products=[

product(id=1,name="phone",description="A smart Phone",price=699.99,quantity=50),

product(id=2,name="Laptop",description="A Powerful Laptop",price=999.9,quantity=30),

product(id=3,name="pen",description="A Blue ink pen",price=19.99,quantity=100),

product(id=4,name="Table",description="A Wooden table",price=220.9,quantity=25)

]

@app.get("/product")

def get_products():

return products

@app.post("/product")

def add_product(product:product):

products.append(product)

return product

Here

@app.get("/product") is an FastAPI path operation decorator . This contains @ is an decoarator syntax ,a decorator in python is way of modifing or add behaviour to a function without actual changing of the code.

app →FastAPI application object

.get→ Specifies http method
“/product”→ is an path
FastAPI's path operation decorator registers a path and HTTP method with a Python function. When a request arrives, FastAPI's routing system matches the request's HTTP method and URL path to the registered function and executes it.

Fast_api Urls

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