Recently I decided it was probably worth upgrading to version 1.11 of Django from 1.10 and thought that it was high time that I moved unto version 3 of Python. There had been any practical reason for delaying expect the work follow and my focus on writing features had been entirely centred around Python 2.7.
As I'm experimenting with more and more third party Django components - I believed more and more it made sense to make the swap.
The swap was very simple. For me it was a case of running the tests and fixing as required and running all my management commands to verify everything works as expected.
The hardest part was swapping over from using
str() respectively and replacing
For deployment it was only a little more complicated. Before I did my
git pull origin master to load my latest changes setup a new virtual environment for Python to install Python 3.4 and the required modules.
virtualenv -p python3 env3
Next I used pip to install the Python models from the requirements file.
pip install -r requirements.txt
Now, the bit which I found out late during the deployment as I hadn't tested before hand. It was necessary for me to replace the
mod_wsgi module for Apache or HTTPD in Fedora for the version need to execute Python 3 code. All the tutorial I've previously read for deploying Django projects seem to assume you're using Python 2.7. This isn't too surprising as the default version is Python 2.7.13 on my Fedora 26 machine.
Start by uninstalling the previous version.
sudo dnf remove -y mod_wsgi
Then install the Python 3 equivalent.
sudo dnf install -y python3-mod_wsgi
Now all is required is to swap the virtualenv directory name in the VirtualHost config...
<VirtualHost *:80> ServerName www.example.com ServerAlias www.example.com Redirect / http://example.com/ </VirtualHost> <VirtualHost *:80> ServerName example.com ServerAlias example.com Alias /static /home/demo/website/static Alias /robots.txt /home/demo/website/static/robots.txt <Directory /home/demo/website/static> Require all granted </Directory> <Directory /home/demo/website/website> <Files wsgi.py> Require all granted </Files> </Directory> WSGIDaemonProcess website python-path=/home/demo/website:/home/demo/website/env3/lib/python2.7/site-packages WSGIProcessGroup website WSGIScriptAlias / /home/demo/website/website/wsgi.py </VirtualHost>
... and the restart of Apache to finish.
sudo systemctl restart httpd