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The first point that the keys may be of any immutable type is the main strength of dictionaries, while the second point is important, too. Just look at the difference here: >>> x = [] >>> x[42] = 'Foobar' Traceback (most recent call last): File "<stdin>", line 1, in IndexError: list assignment index out of range >>> x = {} >>> x[42] = 'Foobar' >>> x {42: 'Foobar'} First, I try to assign the string 'Foobar' to position 42 in an empty list clearly impossible because that position does not exist. To make this possible, I would have to initialize x with [None]*43 or something, rather than simply []. The next attempt, however, works perfectly. Here I assign 'Foobar' to the key 42 of an empty dictionary; no problem! A new item is simply added to the dictionary and I m in business.

Note The Ruby-FCGI library can also be installed through the RubyGems packaging system by executing

Figure 9-7. Highlighting the app and skin directory that house all of the major components of a Magento theme.

Listing 4-1 shows the code for the telephone book example. Here is a sample run of the program: Name: Beth Phone number (p) or address (a) p Beth's phone number is 9102.

The Ruby-FastCGI library contains two different implementations: one native implementation written in C and one written in pure Ruby. In a production environment, you want to use the native implementation because of the performance benefits it provides. By default, the native implementation will be used, but only if the FastCGI shared library can be found. This shared library is created when you compile and install FastCGI from source. To verify that Ruby-FastCGI uses the native implementation of FastCGI, execute the following commands in the interactive Ruby console, irb: $ irb require 'fcgi.so'

To navigate to the default theme folder, you will need to navigate inside the app directory to app design frontend default default. All of the PHTML template files are contained within the template folder, while all of the XML Layouts are contained within the layout folder (see Figures 9-8 and 9-9).

The line require 'fcgi.so' should return true, as shown here. If it returns false, it means it cannot find the fcgi.so library, and so it will run using the pure Ruby implementation. If you get an error saying fcgi.so cannot be found, you might need to add the path to /usr/local/lib to /etc/ld.so.conf and run ldconfig. You can verify that the pure Ruby (slower) version is found by executing the following in irb: $ irb > require 'fcgi'

Listing 4-1. Dictionary Example # A simple database # A dictionary with person names as keys. Each person is represented as # another dictionary with the keys 'phone' and 'addr' referring to their phone # number and address, respectively.

To navigate to the default theme skin directory, you will need to navigate inside the app directory to skin frontend default default. All of the CSS files, images, and javascript files are contained within this directory (see Figure 9-11).