FastAPI | System Design

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FastAPI

Very fast (built on ASGI unlike flask which is built on WSGI)
in built with swagger UI documentation and ReDoc Documentation
supports pydantic for data validation
Totally Based upon open API (Linux foundation, defines how to create an API) and json schema
Starlette features
Supports - SQL, NoSQL, graphQL

ASGI vs WSGI

Swagger and ReDOC Documentation

Pydantic

Streamlit Features

Supports Multiple Databases

Additional Support

works with gunicorn
jwt authentication

Requirements

Python version should be 3.6+
pip install fastapi[all]
pip install gunicorn
pip install uvicorn[standard]
from pydantic import BaseModel

uvicorn -b 0.0.0.0:5020 main:app --reload

# main is the main.py file
# app = FastAPI() instance
# -b binds to particular host and port
# --reload automatically refreshes as soon as we make changes to main.py and save

FastAPI reads the file line-by-line so if there is any error at the start, we don't reach to the lower part of the file

Reference for Further Reading