what is flask

from flask import Flask

app = Flask(__name__)

@app.route('/')
def index():
  return "Hello world!" #if you want to render a .html file, 
                        # import render_template from flask and use 
                        #render_template("index.html") here.

if __name__ == '__main__':
    app.debug = True
    app.run() #go to http://localhost:5000/ to view the page.

from flask import Flask
app = Flask(__name__)

@app.route('/')
def hello_world():
    return 'Hello, World!'

pip install -U Flask

from django.contrib import admin

class BookInline(admin.TabularInline):
    model = Book

class AuthorAdmin(admin.ModelAdmin):
    inlines = [
        BookInline,
    ]

output = {'msg': 'posted'}
response = Response(
    mimetype="application/json",
    response=json.dumps(output),
    status=201
)

from django.db import models

class Author(models.Model):
   name = models.CharField(max_length=100)

class Book(models.Model):
   author = models.ForeignKey(Author, on_delete=models.CASCADE)
   title = models.CharField(max_length=100)