How do I write a single-file Django application?

Question

I want to write a very small Django application in a single file, requiring all the appropriate modules and stuff, and then be able to run that as a normal Python script, li

Answer 1

Here a working example for Django 2.2

import os
import sys
from django.conf import settings
from django.core.management import execute_from_command_line
from django.http import HttpResponse
from django.urls import path

fname = os.path.splitext(os.path.basename(__file__))[0]
urlpatterns = [path(r'', lambda r: HttpResponse('Hello, world!'))]

if __name__ == "__main__":
    settings.configure(DEBUG=True, MIDDLEWARE_CLASSES=[], ROOT_URLCONF=fname)
    execute_from_command_line([sys.argv[0], 'runserver'])