Setting up your system for Minecraft coding

You will need to own Minecraft Java Edition. You can download it here

If you already have a Mojang account, click login. If you haven’t accessed it for years you may need to reset your password. If you already own Minecraft it will then tell you. If you don’t have a Mojang account, create one, and buy Minecraft Java Edition. It is on sale at half-price at the moment.

The rest of the set-up we can do in class, but for those who want a head start, read on.


You need to install Java Runtime Environment version 8.

Download for Windows

Download for Mac

Server setup

Download the Adventures In Minecraft Starter Kit and unpack it in a folder on your desktop. There are videos on the site that explain how to set it up.

I suggest before you first run the server you edit the file Server/ (use Notepad or some other text editor) and change


to generate a flat world. (But it’s up to you what sort of world you prefer!)

To run the server, double click the StartServer file. It will open a server console window, and ask you press space.

If you want to generate another world later you can change


and then run the server again.

Once server is running, to stop nighttime from happening I suggest you type this at the server console

gamerule doDaylightCycle false
time set day

If only we could do that in real life!

You must leave the server console window open at all times. When you want to quit, first type


at the server console, so it saves your world.

Minecraft setup

Run the Minecraft launcher you downloaded from We will not be using the default which is the latest version of Minecraft. Instead we will be using version 1.12.

Click ‘launch options’ then ‘add new’, then set version to ‘release 1.12’. Then click ‘save’. Then click ‘Minecraft’ at the top. Then click the arrow next to ‘Play’ at the bottom. Then select ‘1.12’. Then click ‘Play’.

Minecraft will run. Click ‘multiplayer’. Then ‘add server’. Enter the server address as


Click ‘done’. Click on your server to connect to it.

Mu setup

Mu is the Python editor we have already been using, so you probably already have it installed. However you need to make sure you have the latest ‘alpha version 1.1’, not the regular 1.0. You can download it from the links at the top of this page.

Run Mu. Click ‘Mode’ and select ‘Python3’.

Then click the small gadget icon in the bottom right hand corner of the window. Click ‘third party packages’. Type


Into the box. Click OK. The library will download.

Now you are ready to type in and run a Minecraft program in Mu. Here is one to get you started.

import mcpi.minecraft as minecraft
mc = minecraft.Minecraft.create()
mc.postToChat("Hello Minecraft World")

If that is all too confusing, don’t worry. I will show you how to do it in class.