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When slicing, you specify (either explicitly or implicitly) the start and end points of the slice. Another parameter (added to the built-in types in Python 2.3), which normally is left implicit, is the step length. In a regular slice, the step length is one the slice moves from one element to the next, returning all the elements between the start and end: >>> numbers[0:10:1] [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] In this example, you can see that the slice includes another number. This is, as you may have guessed, the step size, made explicit. If the step size is set to a number greater than one, elements will be skipped. For example, a step size of two will include only every other element of the interval between the start and the end: >>> numbers[0:10:2] [1, 3, 5, 7, 9] numbers[3:6:3] [4] You can still use the shortcuts mentioned earlier; if you want every fourth element of a sequence, you only have to supply a step size of four: >>> numbers[::4] [1, 5, 9] Naturally, the step size can t be zero that wouldn t get you anywhere but it can be negative, which means extracting the elements from right to left:

Description: Lists the available link type attributes for the given type. Return: Array. Argument: $type (required) Can be cross_sell , up_sell , related , or grouped .

books_tags * tag_id book_id *

array ( 0 => array ( 'code' => 'position', 'type' => 'int', ), )

Figure 7-1. Tables used by the tagging system Next, create the migration by executing the generate command: $ script/generate migration CreateTagsAndBooksTags exists db/migrate create db/migrate/006_create_tags_and_books_tags.rb The generate script creates an empty migration script for you. Next, change the script as shown in Listing 7-1.

>>> numbers[8:3:-1] [9, 8, 7, 6, 5] >>> numbers[10:0:-2] [10, 8, 6, 4, 2] >>> numbers[0:10:-2] [] >>> numbers[::-2] [10, 8, 6, 4, 2] >>> numbers[5::-2] [6, 4, 2] >>> numbers[:5:-2] [10, 8] Getting things right here can involve a bit of thinking. As you can see, the first limit (the leftmost) is still inclusive, while the second (the rightmost) is exclusive. When using a negative step size, you have to have a first limit (start index) that is higher than the second one. What may be a bit confusing is that when you leave the start and end indices implicit, Python does the right thing here; for a positive step size it moves from the beginning toward the end, and for a negative step size it moves from the end toward the beginning.

// Prepare data $type = 'cross_sell'; // Using Zend XML-RPC $results = $client->call('call', array($session_id, 'catalog_product_link.attributes', array($type))); // view results var_dump($results);

Listing 7-1. Migration Script for the Tagging Functionality class CreateTagsAndBooksTags < ActiveRecord::Migration def self.up create_table :tags do |table| table.column :name, :string, :limit => 255, :null => false, :unique => true end create_table :books_tags, :id => false do |table| table.column :tag_id, :integer, :null => false table.column :book_id, :integer, :null => false end say_with_time 'Adding foreign keys' do # Add foreign key reference to books_tags table execute 'ALTER TABLE books_tags ADD CONSTRAINT fk_tb_tags FOREIGN KEY ( tag_id ) REFERENCES tags( id ) ON DELETE CASCADE' execute 'ALTER TABLE books_tags ADD CONSTRAINT fk_tb_books FOREIGN KEY ( book_id ) REFERENCES books( id ) ON DELETE CASCADE' end say_with_time 'Adding default tags' do execute(insert_tags_sql) end end def self.down drop_table :books_tags drop_table :tags end def self.insert_tags_sql <<-END_OF_DATA insert into tags values (1,"Romance"), (2,"Cooking"), (3,"Mystery"), (4,"History"), (5,"Politics"), (6,"Elvis"), (7,"Science Fiction") END_OF_DATA end end

Sequences can be concatenated with the addition (plus) operator: >>> [1, 2, 3] + [4, 5, 6] [1, 2, 3, 4, 5, 6] >>> 'Hello, ' + 'world!' 'Hello, world!' >>> [1, 2, 3] + 'world!' Traceback (innermost last): File "<pyshell#2>", line 1, in [1, 2, 3] + 'world!' TypeError: can only concatenate list (not "string") to list As you can see from the error message, you can t concatenate a list and a string, although both are sequences. In general, you can only concatenate two sequences of the same kind.

The sales API is broken up into three main sets: orders, shipping, and invoice. Similar to the previous API sets, you are given the basic view, create, and update. You can use these methods to export your sales data into CSV, Excel, or even to another database.

The script creates the two tables, tags and books_tags. The migration also adds foreign key references to the books and tags tables by executing raw SQL with the execute command. At the end of the migration, the script adds a default set of tags to the tags table by again calling the execute command.

Multiplying a sequence by a number x creates a new sequence where the original sequence is repeated x times: >>> 'python' * 5 'pythonpythonpythonpythonpython' >>> [42] * 10 [42, 42, 42, 42, 42, 42, 42, 42, 42, 42]