Computers always execute code from top to bottom and left to right. You can experiment a bit with this idea here. There are three separate statements in the code box below. The print statement tells the computer to display the text within the double quotes, on the screen. Click the "Run my code..." button to see how the computer processes these lines.

Next, arrange (cut and paste) the lines in any order you wish, and run the code again. Prove to yourself that computers run code from top to bottom.