[Python] How to match the first word of a line and separate subsequent values with a comma

I'm stuck with a problem: I have over one hundred different markdown files and need to update a single line of frontmatter in them. In the tags: line, I need to wrap the values in brackets and separate them by a comma. There's hundreds of different values, so there's not really a pattern there.

Here's an example:

---
layout: post
title: "Blog title"
date: 2016-02-24 09:39:00 -0500
tags: work career code programming
layout: post
---


And it needs to look something like:

---
layout: post
title: "Blog title"
date: 2016-02-24 09:39:00 -0500
tags: ["work", "career", "code", "programming"]
layout: post
---


I'm not sure the best way to do this. I've only been able to target the first value using regex with something like, (?<=tags: ).

I can't figure out how to get the rest of the line and what to do with it from there.

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