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ZPT Basics (part 2)
Add variables and conditional tests to your ZPT templates.

| A Little Male Bonding |

Variables are the bread and butter of any programming language - and TAL is no exception. In TAL, variables are defined via the special "define" attribute, which must be provided with both a variable name and a value (which can be any valid TALES expression). Let's take a look at a simple example, which demonstrates:

<h2>The name's <i tal:define="name string:Bond, James Bond"  tal:content="string:$name">name here</i>.</h2>

Here's how Zope renders it:

''.preg_replace(array('/  /', '/ /'), array('  ', '   '), '
The name's Bond, James Bond.

In this case, the "define" attribute is used to define a variable named "name", and assign it the value "Bond, James Bond". The "string" keyword in the expression is used to indicate that the following text is - well - a string.

<i tal:define="name string:Bond, James Bond" ... >name here</i>

This value may then be accessed using a TAL "content" or "replace" attribute, in combination with the variable name (which must be prefixed by a dollar ($) symbol).

<i ... tal:content="string: $name">name here</i>

You can even set variable values dynamically, by using TALES expressions instead of hard-wired string values. Consider the following example, which illustrates:

<h1>The name's <i tal:define="whoami template/title_or_id" tal:content="string:$whoami">name here</i>.</h1>

Here's the output (assuming that the page title was "Agent007"):

''.preg_replace(array('/  /', '/ /'), array('  ', '   '), '
The name's Agent007.

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