Here's the easiest and fastest way I've found to start coding a python GUI on Ubuntu and how to compile it to a executable. That way anyone can run it without seeing your source-code and without needing to install python or the extra modules.

At the moment Nuitka, the python compiler I use, hasn't quite finished cross-platform portablity, so these will only work on Linux. The website says the "--target-windows" flag is "not yet working fully correctly due to the DLL hell problem with the C runtime" however they "hope to get this right in subsequent releases." Anyway, here we go.

1. first install Nuitka

CODENAME=`lsb_release -c -s`
wget -O - http://nuitka.net/deb/archive.key.gpg | apt-key add -
echo >/etc/apt/sources.list.d/nuitka.list \ 
"deb http://nuitka.net/deb/stable/$CODENAME $CODENAME main"
apt-get update
apt-get install nuitka

2. install python module easygui

if you don't have pip, you can install it with the following code:

sudo apt-get install pip

then get easygui like so

sudo pip install easygui

3. create a python file

gedit "hello_msgbox.py"

4. write a hello world program using easygui

from easygui import msgbox
msgbox("Hello world!", title="My message box")

4. convert it to an executable using nuitka

nuitka --recurse-all --exe hello_msgbox.py

5. run the executable

./hello_msgbox.exe

Lo and behold, you're done. Now go build something!

And if you're just here for the code, I've been there too so here's everything together.

CODENAME=`lsb_release -c -s`
wget -O - http://nuitka.net/deb/archive.key.gpg | apt-key add -
echo >/etc/apt/sources.list.d/nuitka.list \ 
"deb http://nuitka.net/deb/stable/$CODENAME $CODENAME main"
apt-get update
apt-get install nuitka

sudo pip install easygui
echo 'from easygui import msgbox' >> hello_msgbox.py
echo 'msgbox("Hello world!", title="My message box")' >> hello_msgbox.py

nuitka --recurse-all --exe hello_msgbox.py
./hello_msgbox.exe