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Right off the bat, there s confusion in OOP: seasoned developers start talking about objects and classes, and they appear to be interchangeable terms. This is not the case, however, though the difference can be tough to wrap your head around at first. A class, for example, is like a blueprint for a house. It defines the shape of the house on paper, with relationships between the different parts of the house clearly defined and planned out, even though the house doesn t exist. An object, then, is like the actual house built according to that blueprint. The data stored in the object is like the wood, wires, and concrete that compose the house: without being assembled according to the blueprint, it s just a pile of stuff. However, when it all comes together, it becomes an organized, useful house. Classes form the structure of data and actions and use that information to build objects. More than one object can be built from the same class at the same time, each one independent of the others. Continuing with our construction analogy, it s similar to the way an entire subdivision can be built from the same blueprint: 150 different houses that all look the same but have different families and decorations inside.

Now, all that s necessary is to set up a URL configuration that provides both a form class and a template name. This decorator will handle the rest, only calling the view when the form has been completed and submitted for processing.

fieldset#credit_card label { line-height: 1.2em; } See Figure 11-15 much better!

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The syntax to create a class is pretty straightforward: declare a class using the class keyword, followed by the name of the class and a set of curly braces ({}): < php class MyClass { // Class properties and methods go here } > After creating the class, a new class can be instantiated and stored in a variable using the new keyword: $obj = new MyClass; To see the contents of the class, use var_dump(): var_dump($obj); Try out this process by putting all the preceding code in a new file called test.php in the testing folder: < php class MyClass { // Class properties and methods go here }

In order to be truly useful in the real world, forms must be presented to users as part of an HTML page. Rather than trying to generate that HTML content directly inside Python code, Django provides templates as a more designer-friendly alternative.

Figure 11-15. We ve corrected our radio button label alignment by properly setting the line-height property.

$obj = new MyClass; var_dump($obj); > Load the page in your browser at http://localhost/testing/test.php and the following should display: object(MyClass)#1 (0) { } In its simplest form, you ve just completed your first OOP script.

hile 2 made it clear that Django is built entirely on Python, and standard Python rules apply, templates are the exception to the rule Templates are Django s provided way of generating text-based output, such as HTML or emails, where the people editing those documents may not have any experience with Python Therefore, templates are designed to avoid using Python directly, instead favoring an extensible, easy-to-use custom language built just for Django By disallowing arbitrary Python expressions, templates are certainly restricted in some ways, but there are two things to keep in mind First, the template system is backed by Python, just like everything else in Django, so it s always possible to add Python-level code for specific features It s just bad form to include the actual Python code in the template itself, so Django provides other means for plugging in that extra code.

Summary

More importantly, drawing a clear line between templates and the Python code that powers them allows for two separate groups of people, with different backgrounds and skill sets, to work together For many hobbyist projects, this probably sounds like a waste, since the only people working on the site are developers In many commercial environments, however, developers are often a separate group of people from those tasked with maintaining the site s content and visual structure By clearly separating the tasks of development and template editing, it s easy to set up an environment where developers work on the things that they re really needed for, while content editors and designers can work on things that don t really require development experience Django s templates are fairly simple in nature, and easy to pick up by most anyone, even those without any programming experience.

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