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This is an important distinction, because calling directly creates a new-style class, even if it doesn t inherit from , or any subclasses for that matter. This ends up creating two additional attributes on the class that doesn t know how to deal with, so it raises a to indicate the problem. That leaves two options for creating a class: removing the additional attributes or creating an old-style class using some other means. While it would be possible to just remove the attributes that offend , an even better idea would be to provide it exactly what it expects: an old-style class. Clearly, using is out of the question, which leaves us with just declaring a class using standard syntax. Since this is possible even within functions, and its namespace dictionary can be updated with new attributes, it s a decent way to go about solving this problem.

Figure 9-19. Constantia (serif)

This will now accept two attribute dictionaries, one for the model itself, and another for the inner class. This allows full customization of Django models that can be created at any time. While this may seem like a rather abstract concept at the moment, see 11 for a full example of how this can be used in practice to automatically record all changes to a model.

Note You re keeping the size separate from the rest of the options because the element s original font size will

Figure 9-20. Consolas (monospace)

With a solid foundation of Django s models under your belt, the next step is to write some code that will allow users to interact with those models. The next chapter will show how views can provide your users with access to these models.

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be used for returning the element to its original state and that value is not available in the options object.

You might assume that choosing the weight of your font such as boldfaced or not is a simple matter in CSS. You d be both right and wrong. CSS uses the font-weight property for this, and allows for two types of attribute values: keywords and numeric.

uch of this book is split into fairly self-contained chapters, but this one covers two seemingly unrelated concepts together, because each relies very much on the other. URLs are the primary entry points to your site, while views are the code that respond to incoming events. What goes on in a view is very open-ended. Aside from accepting a request and returning a response, there s no particular protocol that views should adhere to, and no rules about what they are or aren t allowed to do. The possibilities for views are too vast to consider describing in detail, and there aren t any utilities designed explicitly for views to use while executing. Instead, it s possible to hook into the process Django uses to map Web addresses to the views they should execute. This makes the link between URLs and views extremely important, and a thorough understanding of it can enable further advanced techniques. Also, in terms of how Django manages incoming requests, URL configurations exist solely to dispatch a request to a view that can handle it. Discussing URLs and URL configurations independently of views would be of little value.

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