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On Mac OS X, you have two choices for installing Python: install it, or don't. You probably want to install it.
Mac OS X 10.2 and later comes with a command-line version of Python pre-installed. If you are comfortable with the command line, you can use this version for the first third of the book. However, the pre-installed version does not come with an XML parser, so when you get to the XML chapter, you'll need to install the full version.
Open the /Applications folder.
Open the Utilities folder.
Double-click Terminal to open a terminal window and get to a command line.
Type python at the command prompt.
Welcome to Darwin! [localhost:~] you% python Python 2.2 (#1, 07/14/02, 23:25:09) [GCC Apple cpp-precomp 6.14] on darwin Type "help", "copyright", "credits", or "license" for more information. >>> [press Ctrl+D to get back to the command prompt] [localhost:~] you%
However, you probably want to install the latest version, which also comes with a graphical interactive shell.
Download the MacPython-OSX disk image from http://homepages.cwi.nl/~jack/macpython/download.html.
If your browser has not already done so, double-click MacPython-OSX-2.3-1.dmg to mount the disk image on your desktop.
Double-click the installer, MacPython-OSX.pkg.
The installer will prompt you for your administrative username and password.
Step through the installer.
After installation is complete, close the installer and open the /Applications folder.
Open the MacPython-2.3 folder
Double-click PythonIDE to launch Python.
The MacPython IDE should display a splash screen, then take you to the interactive shell. If the interactive shell does not appear, select -> (Cmd-0).
Python 2.3 (#2, Jul 30 2003, 11:45:28)
[GCC 3.1 20020420 (prerelease)]
Type "copyright", "credits" or "license" for more information.
MacPython IDE 1.0.1
>>>
Note that once you install the latest version, the pre-installed version is still present. If you are running scripts from the command line, you need to be aware which version of Python you are using.
[localhost:~] you% python Python 2.2 (#1, 07/14/02, 23:25:09) [GCC Apple cpp-precomp 6.14] on darwin Type "help", "copyright", "credits", or "license" for more information. >>> [press Ctrl+D to get back to the command prompt] [localhost:~] you% /usr/local/bin/python Python 2.3 (#2, Jul 30 2003, 11:45:28) [GCC 3.1 20020420 (prerelease)] on darwin Type "help", "copyright", "credits", or "license" for more information. >>> [press Ctrl+D to get back to the command prompt] [localhost:~] you%
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