Month: February 2018

Python programming course using Minetest

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Do you want to learn at home how to program in python while enjoying the fun of building structures in Minetest? These instructions will help you create your own setup similar to the one used at Coderdojo. First of all, make sure you have finished the instructions for the Minetest client install and the Minetest server install.

The steps to configure your course platform:

  1. Install builder_police mod for Minetest.
  2. Install courses in PyCharm Edu

To configure your course platform you will need Internet access to download builder_police from github, ircbuilder python module from pypi.org, and the courses from this website.

To run the course you will need Internet access to a public IRC server (e.g., irc.rizon.net) which handles the communications between your python program and Minetest.

Minetest mods

The following commands are to be typed into Git-Bash (Windows) or Terminal (Mac, Linux). Change directory to the minetest mods directory. If the directory doesn’t exist you may have to create it.

cd Documents/minetest-0.5.0-6cfd699b-irc-win64/mods  # Windows 64 bit
cd Library/Application\ Support/minetest/mods # Mac
cd .minetest/mods                             # Linux
git clone https://github.com/timcu/builder_police.git

Now that you have installed the builder_police mod, you need to enable it in Minetest by selecting “configure” for the world, selecting the “builder_police” mod and clicking the “enabled” check box.

Install courses in PyCharm Edu

    1. Download the following files without unzipping them. Safari users may have to turn off “Open safe files after downloading” in the “General” tab of the Preferences to stop automatic unzipping.
    2. Open PyCharm Edu and select “Browse Courses” from the “File” menu.
    3. Underneath the list of courses, click on the small rectangle with an arrow pointing into it and select “Import a local course”.
    4. Select the downloaded file “Ninja_2_minetest_course_v5.zip”.
    5. Once it has imported you can click on the “Join” button in the bottom right hand corner. Joining a course takes a while because PyCharm will set up a virtual environment for your python programming which doesn’t affect other python programs on your computer.
    6. The virtual environment will detect that you need the python module ircbuilder version 0.0.5 or later and give you an option to install or ignore this requirement. Choose “Install requirement”.
    7. To do the course there are some details you need to set so that your python programs can connect to IRC and Minetest. These details are all stored in a file called “coderdojo.py”. In PyCharm, go to the File menu and select “Open…”. Navigate to your home folder, the folder “PyCharmProjects”, then the folder “Ninja 2 minetest course v5”, select “coderdojo.py” and click “OK”.
mtuser = ""      # your minetest username
mtuserpass = ""  # your minetest password. This file is not encrypted so don't use anything you want kept secret. Can't have spaces in it

# The following must match your settings in minetest server > Settings > Advanced Settings > Mods > irc > Basic >
ircserver = ""   # same as IRC server
mtbotnick = ""   # same as Bot nickname
channel = ""     # same as Channel to join
    1. You need to fill in the values. Here is an example. Of course, you would need different values for mtuser, mtuserpass and channel.
mtuser = "joe"                   # your minetest username
mtuserpass = "mysecretpassword"  # your minetest password. This file is not encrypted so don't use anything you want kept secret. Can't have spaces in it

# The following must match your settings in minetest server > Settings > Advanced Settings > Mods > irc > Basic >
ircserver = "irc.rizon.net"  # same as IRC server
mtbotnick = "mtserver"       # same as Bot nickname
channel = "##minetest3214"   # same as Channel to join
  1. Save this file and you are ready to do the course.
Categories: CoderDojo, Minetest

Minetest server install

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If you want to practice at home building Minetest structures with python programs, you will need to install Minetest server with its mods. Before we start, make sure you have completed the Minetest client install.

The steps to configure the server are:

  1. Install git
  2. Install mods. irc, irc_commands, irc_builder, signs_lib
  3. Configure IRC

Git

Windows users will need to download the latest from https://git-scm.com/ and install. This will also install Git-Bash which is a command line shell similar to those on Mac and Linux.

Linux and Mac users should already have git installed. To test, type the following in the Terminal:

git --version

If it is not installed it will give an error message saying “command not found”. Mac users can download the software from the above site or install it using brew as they did with minetest.

brew install git # Mac

Linux users can install using one of the following if it is not already installed.

apt install git # Ubuntu, Debian
yum install git # Fedora, Centos, Red Hat

Luasocket

The irc mod for minetest requires luasocket. This is difficult to install on windows so I have built a 64 bit version of minetest with irc mod and luasocket already built in. It can be downloaded from minetest-0.5.0-6cfd699b-irc-win64.zip.

On Mac, install luasocket using brew and luarocks.

brew install lua51
luarocks-5.1 install luasocket

On Ubuntu install luasocket using apt and luarocks.

apt install luarocks
luarocks install luasocket

Minetest mods

The following commands are to be typed into Git-Bash (Windows) or Terminal (Mac, Linux). Change directory to the minetest mods directory. If the directory doesn’t exist you may have to create it.

Windows 64 bit

cd Documents/minetest-0.5.0-6cfd699b-irc-win64/mods

Mac

cd Library/Application\ Support/minetest/mods
git clone --recursive https://github.com/minetest-mods/irc.git

Linux

cd .minetest/mods
git clone --recursive https://github.com/minetest-mods/irc.git

Windows / Mac / Linux

git clone https://github.com/ShadowNinja/minetest-irc_commands.git
git clone https://github.com/minetest-mods/signs_lib.git
git clone https://github.com/timcu/irc_builder.git
mv minetest-irc_commands irc_commands

Configure mods and IRC

Every Minetest world in which you want to use these mods needs to have them enabled.

  1. Run Minetest.
  2. Select [Settings] tab, then [Advanced Settings] button in bottom left
  3. Expand: + Server / Singleplayer + Security
  4. [Edit] secure.trusted+mods. type in irc
  5. Expand: + Mods + irc + Basic
  6. [Edit] Bot nickname. For example: mtserver
  7. [Edit] IRC server. I like Rizon which has server: irc.rizon.net
  8. [Edit] Channel to join. Choose a unique channel . eg ##minetest3214
  9. Port number can be 6667 and Auto-connect enabled. Channels starting with ## are generally temporary channels. Remember these settings to use in your python program. Make sure your IRC server allows several connections from the same IP address.
  10. From the [Local Game] tab, select your world and click on [Configure]
  11. Select mod on the right and click the “enabled” check box above for each of the four
  12. Click [Save] button to return to [Local Game] tab
  13. Type in a password in green password field and click [Host Game]
  14. Users who wish to build structures from python will need privilege irc_builder. After they have logged in grant them this privilege by typing /grant username irc_builder

Program in Python 3

Now you can start to write programs in Python which will build structures in Minetest. Remember to install ircbuilder python module in your python virtual environment so that your program can communicate with IRC and hence with Minetest. You can do this in PyCharm Edu from Settings (Windows) or Preferences (Mac) > Project > Project Interpreter > + (and type in ircbuilder).

Categories: CoderDojo, Minetest

Minetest client install

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At CoderDojo this term we will be learning to program in Python 3 to build structures in a Minetest world. Minetest is a free, open-source, high performance Minecraft clone that is easily modded. There already exist mods which allow chat commands to be executed over IRC (Internet Relay Chat). I have created a Minetest mod (irc_builder) to add chat commands allowing us to build structures using those commands. I have also created a python module (ircbuilder) which sends commands through IRC to the Minetest world.

To set up a client computer you only need install three things:

  1. Python 3
  2. PyCharm Edu v2017.3
  3. Minetest v0.4.16

Python 3

Windows or Mac: From the Python website download Python 3.6.4 or later. Install it using the default settings, plus select “Add Python 3.6 to PATH” which is unticked by default.

Linux:

sudo apt install python3 # Debian, Ubuntu
sudo yum install python3     # Red Hat, Fedora, Centos

PyCharm Edu

PyCharm Edu is a free open source integrated development environment (IDE) for Python, better than IDLE which comes with Python. It also can guide students through a course of lessons and tasks, providing hints and checking on tprogress automatically.

Windows, Mac, Linux: Download PyCharm Edu v2017.3 or later from the Jetbrains website. Install using defaults. The courses will be provided as zip files with the names

Ninja_1_countdowns_and_number_guessing
Ninja_2_minetest_course_v6

To open a course

File menu > Browse Courses > Click the green arrow > Import local course > Select one of the above two files > Click Join

Minetest

You can install minetest client without any mods as server mods only need to be installed on the server and then every client can use them.

Windows 64 bit

Download Minetest v0.4.16 (portable 64  bit) from the Minetest website. Extract the zip file to your Documents folder. The program can be run by double clicking on Documents\minetest-0.4.16-win64\bin\minetest.exe

Windows 32 bit

Download Minetest v0.4.16 (portable 32  bit MSVC) from the Minetest website. Extract the zip filet to your Documents folder. The program can be run by double clicking on Documents\minetest-0.4.16-win32-msvc\bin\minetest.exe

Mac

The Mac version of Minetest needs to be installed using Terminal (Applications/Utilities). If you haven’t installed brew, install it first with (one line):

/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

Then install minetest from Terminal with:

brew cask install xquartz
brew install minetest

Minetest can be run by double clicking /usr/local/opt/minetest/minetest.app or from Terminal with:

/usr/local/opt/minetest/minetest.app/Contents/MacOS/minetest
Linux
sudo apt install minetest # Debian, Ubuntu
sudo yum install minetest     # Red Hat, Fedora, Centos

Minetest can be run by typing minetest on command line.

Categories: CoderDojo, Minetest