{"id":396,"date":"2026-04-30T14:31:25","date_gmt":"2026-04-30T12:31:25","guid":{"rendered":"https:\/\/dataguide.tech\/?p=396"},"modified":"2026-04-30T14:31:26","modified_gmt":"2026-04-30T12:31:26","slug":"build-fabric-notebooks-library","status":"publish","type":"post","link":"https:\/\/dataguide.tech\/index.php\/2026\/04\/30\/build-fabric-notebooks-library\/","title":{"rendered":"Build Your Own Python Library for Microsoft Fabric Notebooks"},"content":{"rendered":"\n

When you’ve got more than one data engineer building things in Microsoft Fabric, you’ve probably hit the same little annoyance I did: everyone is quietly rewriting the same helper functions. Same string concat. Same date parser. Same five-line utility nobody can find when they actually need it.<\/p>\n\n\n\n

There are a few ways to tackle this – sharing notebooks, dropping things into a “shared tools” workspace, or pinning best practices into team docs. They all sort of work. But honestly, the cleanest way I’ve found is to package your code into a proper Python library and install it through your custom Environment.<\/p>\n\n\n\n

This post builds on top of my previous one: Custom Environment – what’s that, what is the reason<\/a>. If you haven’t read that yet, give it a quick look first – I’ll skip over the Environment basics here and focus only on the library part.<\/p>\n\n\n\n

How It Works in Fabric<\/h1>\n\n\n\n

Quick mental model before we touch any code: you build your own Python package, compile it into a .whl<\/code> (wheel) file, and upload that wheel to your Fabric Environment as a custom library. Any notebook that uses that Environment gets your code as a normal import – no pip install<\/code> cells, no copy-pasting helpers between notebooks.<\/p>\n\n\n\n

For this post I built a tiny library that just concatenates strings. Nothing exciting on its own, but the structure scales – once you’ve got the wheel pipeline working, you can drop in date helpers, file utilities, ingestion patterns, whatever your team keeps reinventing.<\/p>\n\n\n\n

Here’s what it looks like once it’s uploaded into the Environment:<\/p>\n\n\n\n

\"Pasted<\/figure>\n\n\n\n

And here’s the same library being imported and used in a notebook:<\/p>\n\n\n\n

\"Pasted<\/figure>\n\n\n\n

Clean. Reusable. Your team stops duplicating logic across the tenant.<\/p>\n\n\n\n

Ok, now the actual build.<\/p>\n\n\n\n

Setting Up the Project Structure<\/h1>\n\n\n\n

I’m using VS Code for this. Any Python-friendly editor works, but the screenshots will be from VS Code.<\/p>\n\n\n\n

The folder layout I use for a small library:<\/p>\n\n\n\n

Python<\/span>