Article not in sync with what's expected.
After having made this statement "With the growing software-defined networking trend, networking pros are under pressure to learn some coding. Here are a dozen programming languages worth checking out.", it looks like most of the languages mentioned aren't of any use to a network admin or for that matter even to a networking engineer.
In general, most of the languages are in their nascent stage.
Python, Chef/Puppet are the ones predomintely used in devops, unless you are saying that network admins are also the ones doing web development.