Our helloworld-cf-template.py script is fairly basic. At this point, we are only taking advantage of Python as far as using the troposphere library to easily generate JSON output in a more pleasant way than if we had to write it by hand. Of course, you might already realize that we are barely scratching the surface of what we can do when we have the ability to write scripts to create and manage infrastructures. The following section is a simple example that will let us write a couple more lines of Python and illustrate the concept of updating a CloudFormation stack, while taking advantage of more services and external resources.
The security groups we created in our previous example open up two ports to the world: ...
