django_commands.txt

django-admin startproject mysite                # Setup
python manage.py runserver                      # Run Server
python manage.py startapp appname               # start a new app
mysite/settings.py				# edit basic configuration, e.g. database engine
mysite/appname/models.py		        # file for new data model
python manage.py makemigrations appname         # create migrations from new data model
python manage.py sqlmigrate appname mignumber   # view the sql-code of that migration
python manage.py check				# check if everythings alright with the code
python manage.py migrate			# apply the migration
python manage.py shell				# run a python shell in which you can use and edit the data model entries
python manage.py createsuperuser		# create a superuser with a certain admin name
http://127.0.0.1:8000/admin/			# view the admin site
mysite/appname/views.py				# create different views of your system
mysite/appname/urls.py				# connect a view to a url



Code Snippets:

Make app modifiable by admin
:appname/admin.py
from django.contrib import admin
from .models import Question
admin.site.register(Question)

Create html templates to be filled with data from database:
:appname/templates/polls/index.html
{% if latest_question_list %}
    <ul>
    {% for question in latest_question_list %}
        <li><a href="/polls/{{ question.id }}/">{{ question.question_text }}</a></li>
    {% endfor %}
    </ul>
{% else %}
    <p>No polls are available.</p>
{% endif %}


View a filled template:
:appname/views.py
from django.http import HttpResponse
from django.template import loader
from .models import Question
def index(request):
    latest_question_list = Question.objects.order_by('-pub_date')[:5]
    template = loader.get_template('polls/index.html')
    context = {
        'latest_question_list': latest_question_list,
    }
    return HttpResponse(template.render(context, request))

Faster rendering:
:appname/views.py
from django.shortcuts import render
from .models import Question
def index(request):
    latest_question_list = Question.objects.order_by('-pub_date')[:5]
    context = {'latest_question_list': latest_question_list}
    return render(request, 'polls/index.html', context)


Raising a 404 error:
:polls/views.py
from django.http import Http404
from django.shortcuts import render
from .models import Question
# ...
def detail(request, question_id):
    try:
        question = Question.objects.get(pk=question_id)
    except Question.DoesNotExist:
        raise Http404("Question does not exist")
    return render(request, 'polls/detail.html', {'question': question})