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Django 4 : Install
2022/03/16
 
Install Django which is Python Web Application Framework.
[1] Install Django under the Python venv. It's possible to do for any common user.
[cent@dlp ~]$
python3 -m venv --system-site-packages ~/django

[cent@dlp ~]$
source ~/django/bin/activate

(django) [cent@dlp ~]$
pip3 install django==4

Collecting django==4
  Downloading Django-4.0-py3-none-any.whl (8.0 MB)
     |################################| 8.0 MB 3.3 MB/s
Collecting sqlparse>=0.2.2
  Downloading sqlparse-0.4.2-py3-none-any.whl (42 kB)
     |################################| 42 kB 275 kB/s
Collecting asgiref<4,>=3.4.1
  Downloading asgiref-3.5.0-py3-none-any.whl (22 kB)
Installing collected packages: sqlparse, asgiref, django
Successfully installed asgiref-3.5.0 django-4.0 sqlparse-0.4.2
WARNING: You are using pip version 21.2.3; however, version 22.0.4 is available.
You should consider upgrading via the '/home/cent/django/bin/python3 -m pip install --upgrade pip' command.

(django) [cent@dlp ~]$
django-admin --version

4.0
# to exit from venv, run like follows

(django) [cent@dlp ~]$
deactivate

[cent@dlp ~]$
[2] Create a test project.
If Firewalld is running and also access to Django from other Hosts, Allow ports you plan to use with root privilege before it. (example below uses [8000/tcp])
[cent@dlp ~]$
source ~/django/bin/activate
# create testproject

(django) [cent@dlp ~]$
django-admin startproject testproject

(django) [cent@dlp ~]$
cd testproject

# configure database (default is SQLite)

(django) [cent@dlp testproject]$
python manage.py migrate
# create admin user

(django) [cent@dlp testproject]$
python manage.py createsuperuser

Username (leave blank to use 'cent'):
cent

Email address:
cent@dlp.srv.world

Password:
Password (again):
Superuser created successfully.
(django) [cent@dlp testproject]$
vi testproject/settings.py
# line 28 : set if you allow to access to Django from other Hosts
# specify Hosts with comma separated
# if allow all, specify like follows

ALLOWED_HOSTS = [
'*'
]
# start server

(django) [cent@dlp testproject]$
python manage.py runserver 0.0.0.0:8000

Watching for file changes with StatReloader
Performing system checks...

System check identified no issues (0 silenced).
March 16, 2022 - 01:00:59
Django version 4.0, using settings 'testproject.settings'
Starting development server at http://0.0.0.0:8000/
Quit the server with CONTROL-C.
[4] Access to the [(server's hostname or IP address):8000/] from a client computer. It's OK if following site is displayed normally.
[5] It's possible to use admin site on [(server's hostname or IP address):8000/admin].
[6] Create a test application to try to use Django.
[cent@dlp ~]$
source ~/django/bin/activate
(django) [cent@dlp ~]$
cd testproject

(django) [cent@dlp testproject]$
python manage.py startapp test_app

(django) [cent@dlp testproject]$
vi test_app/views.py
# add to the end

from django.http import HttpResponse
def main(request):
    html = '<html>\n' \
           '<body>\n' \
           '<div style="width: 100%; font-size: 40px; font-weight: bold; text-align: center;">\n' \
           'Django Test Page\n' \
           '</div>\n' \
           '</body>\n' \
           '</html>\n'
    return HttpResponse(html)

(django) [cent@dlp testproject]$
vi testproject/urls.py
# line 17, 21 : add like follows

from django.contrib import admin
from django.urls import path, include

urlpatterns = [
    path('admin/', admin.site.urls),
    path('test_app/', include('test_app.urls')),
]

(django) [cent@dlp testproject]$
vi test_app/urls.py
# create new

from django.urls import path
from .views import main

urlpatterns = [
    path('', main, name='home')
]

(django) [cent@dlp testproject]$
vi testproject/settings.py
# line 33 : add test application in [INSTALLED_APPS] section

INSTALLED_APPS = (
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'test_app',
)

(django) [cent@dlp testproject]$
python manage.py runserver 0.0.0.0:8000

[7] Access to the [(server's hostname or IP address):8000/testapp/] from a client computer. It's OK if testapp is displayed normally.
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