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Line 1: [[File:Python-logo.png\|300px]] We are going to install Python version 3.4.1. Lucky for us, OS X comes with Python installed! All we need to do is make sure we have an appropriate version of Python installed and make sure we can start a Terminal and run Python from the command line. If you already have Python installed, check the Python version: if the version number starts with a 3 (as opposed to a 2), you can use it for this class and can skip to [[O%27Reilly_Introduction_to_Python/Section_1/OSX_set_up_Python#Checking_your_Python_installation\|checking your Python installation]]. __TOC__ == Download and install Python == * <b>If you are running OS X version 10.6 or later</b>, click https://www.python.org/ftp/python/3.4.1/python-3.4.1-macosx10.6.dmg to download the Python installer. * <b>If you are running OS X version 10.5</b>, click and download the Python installer from [https://www.python.org/ftp/python/3.4.1/python-3.4.1-macosx10.5.dmg this link instead]. * <b>If you have a version of OS X older than 10.5</b>, please upgrade to a newer version of OS X before installing Python. Once the download is complete, double-click on the installer to run it and complete the installation. == Checking your Python installation == Line 9 ⟶ 21: <br /> This ~~Terminal gives you something called a~~ terminal ~~prompt. This terminal prompt~~ is another way of navigating your computer and running programs -- just textually instead of graphically. We are going to be running Python and Python scripts from this ~~terminal~~Terminal prompt. </li> <li>Test your Python install at the command prompt. Type <pre> python3 ~~python~~ </pre> and press Enter. You should see something like <pre> Python 23.74.51 (~~r261~~v3.4.1:~~67515~~d047928ae3f6, ~~Feb~~May 1113 ~~2010~~2013, 0012:5145:2922) [GCC 4.2.1 (Apple Inc. build 5646)] on darwin Type "help", "copyright", "credits" or "license" for more information. Line 26 ⟶ 38: You just started Python! The <code>>>></code> indicates that you are at a new type of prompt -- a Python prompt. The command prompt let's you navigate your computer and run programs, and the Python prompt lets you write and run Python code interactively.<br /> Check the Python version in your Terminal output (the version in the example above is 2.7.5). It needs to be a version between Python 2.5 and Python 2.7 for this class. If you have too old or too new a version, please visit http://python.org/ftp/python/2.7.5/python-2.7.5-macosx10.6.dmg to download and install Python version 2.7.5. </li> Line 45 ⟶ 55: [[File:Champagne.png\|100px]][[File:Party.png\|125px]] [[O'Reilly Introduction to Python/Section 1\|« Back to the ~~Unit~~Section 1 main page]]