Junior — Middle

Describe your approach to creating a web application based on FastAPI and the main implementation steps.

sobes.tech AI

Answer from AI

FastAPI is a modern, fast (high-performance) web framework for Python that allows quick creation of APIs with minimal effort.

Main steps to create a web application with FastAPI:

Installation: Install FastAPI and an ASGI server, for example, Uvicorn:

pip install fastapi uvicorn

Create the application: Import FastAPI and instantiate the app.
Define routes (endpoints): Use decorators like @app.get(), @app.post(), etc., to define request handlers.
Data models: Use Pydantic models for data validation and serialization.
Run the server: Launch the app with Uvicorn.

Example of a simple app:

from fastapi import FastAPI
from pydantic import BaseModel

app = FastAPI()

class Item(BaseModel):
    name: str
    price: float

@app.get("/")
async def read_root():
    return {"message": "Hello, FastAPI!"}

@app.post("/items/")
async def create_item(item: Item):
    return {"item_name": item.name, "item_price": item.price}

Start the app:

uvicorn main:app --reload

This approach enables rapid development, automatic documentation generation (Swagger UI), and convenient type validation.

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