main.py

from fastapi import FastAPI
from typing import Optional
from pydantic import BaseModel

app = FastAPI()  #instance of the app

@app.get('/blog')
def index(limit=10, published: bool = True, sort: Optional[str] = None):

    # only get published blogs

    if published:
        return {"data":f"{limit} published blogs from the database"}
    else:
        return {"data":f"{limit} blogs from the database"}


@app.get("/blog/unpublished")
def unpublished():
    return{"data":"all unpublished blogs"}

@app.get('/blog/{id}')
def show(id: int):

    # fetch blog with id = id

    return {"data" : id}


@app.get('/blog/{id}/comments')
def comments(id, limit=10):

    # fetch comments of blog with id = id

    return {"data":{"1","2"}}

class Blog(BaseModel):
    title: str
    body: str
    published: Optional[bool]

@app.post("/blog")
def create_blog(blog: Blog):
    return {"data":f"Blog is created with title as {blog.title}"}