*Episode 7* PYTHON (Creating a Hello World App with Django)

Creating a Hello World app

This episode covers:-

 1.) How to create apps.

 2.) Introduction on views, paths and templates.

•  Setup :-

Terminal

cp -fr 08-Django-Project 09-Hello-World

cd 09-Hello-World

source ../venv/bin/activate

•  Creating apps :-

Use startapp command to create a new app:

Terminal

python manage.py startapp myapp

Now you should have this kind of folder structure:

Folder structure

projects

├── 08-Django-Project

├── 09-Hello-World

│ ├── db.sqlite3

│ ├── manage.py

│ ├── myapp # < new app

│ └── mysite

└── venv

      Edit mysite app settings.py file and add myapp to the INSTALLED_APPS list:

mysite/settings.py

INSTALLED_APPS = [

'django.contrib.admin',

'django.contrib.auth',

'django.contrib.contenttypes',

'django.contrib.sessions',

'django.contrib.messages',

'django.contrib.staticfiles',

'myapp', # < here

]

•  Creating template files :-

     Create index.html file in the myapp templates folder. You have to create the templates and myapp folders too:

Folder structure for templates

├── 09-Hello-World

│ ├── db.sqlite3

│ ├── manage.py

│ ├── myapp

│ │ ├── templates <-- here

│ │ │ └── myapp <-- here

│ │ │ └── index.html <-- here

     Add this HTML markup inside the index.html file:

myapp/templates/myapp/index.html

<h1>Hello world! I was brought to you by the myapp index vi\

ew.</h1>

Creating views :-

      Edit myapp app views.py file and add an index function:

myapp/views.py

from django.shortcuts import render

def index(request): # < here

return render(request, 'myapp/index.html')

•  Adding a homepage path :-

       Edit mysite app urls.py file add the index path to the urlpatterns list:

mysite/urls.py

from django.contrib import admin

from django.urls import path

from myapp import views as myapp_views # < here

urlpatterns = [

path('admin/', admin.site.urls),

path('', myapp_views.index, name='index'), # < here

]

      Run the development server:

Terminal

python manage.py runserver

     Visit http://127.0.0.1:8000 and you should see this:

       We will deepen the knowledge about templates, views and paths as we go along.

Summary

•  startapp command creates new apps.
•  Don’t forget to add the app to the mysite/settings.py file INSTALLED_APPS list.
•  app/templates/app/ is a typical location for app template files.
•  app/views.py file is a typical location for app view functions.
•  mysite/urls.py file is a typical location for URL patterns.

👈Episode 6(P).                                                                                  Episode 8(P)👉

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