O'Reilly Introduction to Python/Section 1/OSX set up Python

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We are going to install Python version 3.4.1.

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 checking your Python installation.

Download and install Python[edit]

Once the download is complete, double-click on the installer to run it and complete the installation.

Checking your Python installation[edit]

  1. Start up a Terminal. You can find the Terminal application through Spotlight, or navigate to Applications/Utilities/Terminal.

    This terminal 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 prompt.
  2. Test your Python install at the command prompt. Type
    python3
    

    and press Enter. You should see something like

    Python 3.4.1 (v3.4.1:d047928ae3f6, May 13 2013, 12:45:22) 
    [GCC 4.2.1 (Apple Inc. build 5646)] on darwin
    Type "help", "copyright", "credits" or "license" for more information.
    >>>
    

    You just started Python! The >>> 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.

  3. To exit the Python prompt, type
    exit()
    
    and press Enter. This will take you back to the OS X terminal prompt.

Success![edit]

You have tested your Python installation.

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