Book Image

Python Network Programming Techniques

By : Marcel Neidinger
Book Image

Python Network Programming Techniques

By: Marcel Neidinger

Overview of this book

Network automation offers a powerful new way of changing your infrastructure network. Gone are the days of manually logging on to different devices to type the same configuration commands over and over again. With this book, you'll find out how you can automate your network infrastructure using Python. You'll get started on your network automation journey with a hands-on introduction to the network programming basics to complement your infrastructure knowledge. You'll learn how to tackle different aspects of network automation using Python programming and a variety of open source libraries. In the book, you'll learn everything from templating, testing, and deploying your configuration on a device-by-device basis to using high-level REST APIs to manage your cloud-based infrastructure. Finally, you'll see how to automate network security with Cisco’s Firepower APIs. By the end of this Python network programming book, you'll have not only gained a holistic overview of the different methods to automate the configuration and maintenance of network devices, but also learned how to automate simple to complex networking tasks and overcome common network programming challenges.
Table of Contents (14 chapters)

Loading Jinja2 templates in Python

In this chapter, we will use our Python scripts as both an information source for our template and as the software that starts the rendering of our template into a string that we can then either display or write to a file for later usage.

In this recipe, we will set up the directory structure for our templates and create a Jinja2 environment in our Python script. This Jinja2 environment will then allow us to load and render our first template, written in Jinja2, from Python.

Getting ready

Open your code editor and start by creating a file called render_template.py. Next, navigate your terminal to the same directory that you just created the render_template.py file in.

Next, in the same directory as your Python file, create a directory called templates. Inside of this directory, create a file called first.conf.tpl.

How to do it...

Let's start by writing our Python script to load and render our first template before adding some...