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This page tells you how to setup a Python programming environment for your Mac OS X computer and provides a step-by-step guide for creating and running a simple 'Hello, world' Python program. All of the software is freely available on the Web. These instructions are for MacOS X 10.13 (High Sierra), but the instructions for other recent versions of Mac OS X are similar.

Overview

The Python programming environment required by this booksite consists of:

Python, that is, the Python compiler/interpreter.
The Python standard libraries.
IDLE, the Python Integrated DeveLopment Environment.
The Tkinter, NumPy, and Pygame libraries, which are used by the booksite programs that do graphics or audio processing.
The booksite library, that is, a set of modules that we developed specifically to support this booksite.
The Terminal application that is bundled with Mac OS X.

Downloading and Installing Python, IDLE, Tkinter, NumPy, and Pygame

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.

Python 2 is bundled with Mac OS X. However, Python 3 is not. We recommend that you download and install Python 3, and use Python 3 exclusively when running programs associated with this booksite.

Perform these steps to download and install Python, IDLE, Tkinter, NumPy, and PyGame:

Browse to the Python for Mac download page.
In the resulting page click on the Download Python 3.6.5 button. Your browser will download the file python-3.6.5-macosx10.6.pkg to your Downloads directory.
Using Mac Finder Manager, navigate to your Downloads directory, and double-click on the python-3.6.5-macosx10.6.pkg file to install Python, Tkinter, and IDLE. Use the default options. (It's OK to delete the python-3.6.5-macosx10.6.pkg file after the installation is complete.)
Open a Terminal window. To do that, click on the Spotlight Search icon on the right end of the menu bar. (It has the appearance of a magnifying glass.) In the resulting dialog box, type Terminal.app followed by the Enter key.
In the Terminal window issue these commands to install NumPy and PyGame:

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

Perform these steps to test your installation:

In the Terminal window issue the python3 command. You should see something like this:
If you see that output, then your installation of Python, IDLE, and Tkinter was successful.
At the Python >>> prompt, type import numpy followed by the Enter key. If no error messages appear, then your installation of NumPy was successful.
At the Python >>> prompt, type import pygame followed by the Enter key. If no error messages appear, then your installation of PyGame was successful.
How to use my passport for mac. At the Python >>> prompt, type exit() followed by the Enter key to exit Python.
In the Terminal window issue the command idle3. If an IDLE window appears, then you have installed IDLE properly. Close the IDLE window.
Close the Command Prompt window.

IMPORTANT: When running the Python programs associated with this booksite, do not issue the python command. Instead issue the python3 command. The former command runs the Python 2 compiler/interpreter that is bundled with Mac OS X; the latter command runs the Python 3 compiler/interpreter that you installed by following the instructons on this page.

Downloading and Installing the Booksite Library

Perform these steps to download and install the booksite library:

Use your Web browser to download this introcs-1.0.zip file to your /Users/yourusername/Downloads directory.
In the Finder, double click on /Users/yourusername/Downloads/introcs-1.0.zip to unzip the file, thus creating a directory named /Users/yourusername/Downloads/introcs-1.0. (It's OK to delete the /Users/yourusername/Downloads/introcs-1.0.zip file after you have unzipped it.)
Open a Terminal window.
At any time the Terminal application has a working directory. Initially the working directory is /Users/yourusername. 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/Downloads/introcs-1.0. (Incidentally, the cd . command changes your working directory to the 'parent' of the current working directory.)
Issue the ls command to display the names of all files in your working directory. Make sure that a file named setup.py is in your working directory.
Issue the python3 setup.py install --user command. 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.

Perform these steps to test your installation of the booksite library:

In the Terminal window issue the python3 command.
At the Python >>> prompt, type the statement import stdio followed by the Enter key. If Python generates no error messages, then you have installed the booksite library properly.
At the Python >>> prompt, type exit() followed by the Enter key to exit Python.
Close the Terminal window.

Configuring IDLE

So far you've downloaded and installed all of the software that you'll need. You should perform one more step before creating your first program: configure the IDLE programming environment. Follow these instructions:

Open a Terminal window.
In the Terminal window issue the command idle3 to launch IDLE.
Click on the Python → Preferences.. menu item.
Click on the General tab.
Click on the Open Edit Window radio button.
Click on the Ok button.
Close the IDLE window.
Close the Terminal window.

Composing Your First Program

Having installed Python, the Python standard libraries, IDLE, Tkinter, NumPy, Pygame, and the booksite libraries, and having configured IDLE, you are ready to compose your first Python program. Perform these instructions:

Using the Mac Finder, create a directory named /Us

Compiler For Mac Os X