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If the computer writes Hello, World to the Terminal window, then the execution of your helloworld.py program was successful.

These instructions are for MacOS X 10.13 (High Sierra), but the instructions for other recent versions of Mac OS X are similar.

Note: The Mac Finder application uses the term folder to mean a container of documents and, perhaps, other folders.

This document instead uses the equivalent Unix term directory.

We recommend that you download and install Python 3, and use Python 3 exclusively when running programs associated with this booksite.

Use the default options.

To do that, click on the Spotlight Search icon on the right end of the menu bar.

To issue a command you should type the command followed by the Enter key.

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Type help, copyright, credits or license for more information.

If no error messages appear, then your installation of NumPy was successful.

If no error messages appear, then your installation of PyGame was successful.

The former command runs the Python 2 compilerinterpreter that is bundled with Mac OS X; the latter command runs the Python 3 compilerinterpreter that you installed by following the instructons on this page.

In the Terminal window issue the cd Downloads command to change your working directory to Users yourusername Downloads, and then issue the cd introcs-1.0 command to change your working directory to Users yourusername Downloadsintrocs-1.0.

Incidentally, the cd.

Make sure that a file named setup.py is in your working directory.

The computer copies the files defining the booksite modules to a directory where Python can find them, and writes status messages to your Terminal window to indicate its progress.

If Python generates no error messages, then you have installed the booksite library properly.

You should perform one more step before creating your first program: configure the IDLE programming environment.

The trailing ampersand tells the computer to run the idle3 program in the background, thereby leaving your Terminal application free to handle additional commands while IDLE is running.

Use the arrow keys, mouse, or touchpad to move within the text that you have typed.

Be careful; the smallest typing mistake might cause the program to fail.

Save it in a file named helloworld.py in the directory Users yourusername hello.

The file name is case sensitive, so make sure you use all lowercase letters.

It is possible to run some Python programs from within IDLE, but you should run the programs associated with this booksite directly from a Terminal window.

Confirm that the working directory contains your helloworld.py file.

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