What are the advantages and possible disadvantages of using FastAPI for web application development?

FastAPI is a modern web framework for Python, focused on high performance and ease of development.

Advantages:

• Very high speed thanks to ASGI and Starlette.
• Automatic API documentation generation (Swagger UI, ReDoc).
• Support for asynchronous programming.
• Data validation and serialization with Pydantic.
• Simple and concise code.

Disadvantages:

• Smaller community and ecosystem compared to Django or Flask.
• Can be harder for beginners to understand async and typing.
• Some extensions and plugins may be missing or less mature.

Example of a simple FastAPI app:

from fastapi import FastAPI

app = FastAPI()

@app.get("/items/{item_id}")
async def read_item(item_id: int):
    return {"item_id": item_id}