All python codes inside this site can be run with several ways, but the official and the best Cross-platform is python IDLE.

Step 1

Open your terminal for installing idle and type;

sudo apt-get install idle

Step 2

Terminal will ask to install IDLE type "Y" and Return; 

Step 3

After installation complete you can type;

sudo idle

Step 4

This will open the IDLE GUI; 

Step 5

Than you can run your scripts; using File>Open menu; 

Step 6

Than select your python script, this will open your script in a new window; 

Step 7

After this you can run your script with; pressing F5 key in your keyboard or Run>Run Module menu; 

Step 8

Or you can just test your IDLE with this two simple lines;

#!/usr/bin/python 
print 'Hello, world!'

Step 9

IDLE should give this expected output;

Hello, world!
>>>