This is the solution code to the Django official tutorial, using:
$ python --version && echo -n 'Django ' && python -m django --version
Python 3.6.1
Django 2.1.2
mkdir ~/.virtualenv-3.6.1
virtualenv ~/.virtualenv-3.6.1/django-2.1
. ~/.virtualenv-3.6.1/django-2.1/bin/activate
pip install django=='2.1.*'
git checkout https://github.com/seguri/django-polls-tutorial
cd django-polls-tutorial
git checkout -b django-2.1
python manage.py migrate
python manage.py createsuperuser
python manage.py runserver
. ~/.virtualenv-3.6.1/django-2.1/bin/activate
python manage.py runserver