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the same thing. A typeface is a particular design of type (Baskerville, Caslon, Helvetica, etc.). A font, in the digital age, is the particular file on your computer that holds an entire set of glyphs, or characters, for a particular typeface. Traditionally, a font was a collection of wood or metal characters for a particular typeface. So, Helvetica is a typeface. There are several different fonts of that typeface, some of which are digital and some of which are physical, and each of which has its own inconsistencies and quirks. There are also other typefaces based on Helvetica, such as Helvetica Neue. Helvetica Neue is rightfully a typeface of its own, and not just a font of Helvetica, because it is not exactly the same design it s only based on the original Helvetica. Helvetica Bold and Helvetica Condensed are fonts within the typeface known as Helvetica.

Given the wide array of tools available for individual models to customize their behavior, their interaction with the database, and that of the field associated with it, the options are nearly limitless. The techniques that follow represent just a small portion of what s possible.

Classifying type is a complex science if you want to get specific about it. For a great read on type classification, and typography in general, check out Robert Bringhurst s The Elements of Typographic Style, 2nd edition (Hartley & Marks Publishers, 2002). For the purposes of this book, though, you only need to understand the five font classifications defined by CSS (termed generic font families).

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When working with certain types of data, it s sometimes quite expensive to construct a complex Python object to represent a given value. Worse yet, some parts of the application might not even use that object, even though the rest of the model might be necessary. Some examples of this in the real world are complex geographic representations or large trees of nested objects. In these cases, we must be able to get access to the full object when necessary, but it s very important for performance to not have that object constructed if it won t be used. Ideally, the data would be loaded from the database when the model is instantiated, but the raw value would just sit on the instance without being loaded into the full object. When the attribute is accessed, it would be constructed at that point, then cached so that subsequent accesses don t have to keep reconstructing the object. Looking back again to 2, descriptors are the perfect tool for this task, since they allow code to be run at the exact moment an attribute is accessed. Some care must be taken to make sure that the fully constructed object is cached properly for future use, but by using a separate and , this is also fairly straightforward.

Figure 9-25. The error message in an alert box after failing validation After clicking the OK button in the alert box, the user will be able to edit her entry without having to repopulate any fields.

Serif (font-family: serif;)

To illustrate how this would work in practice, consider a field designed to store and retrieve a pickled copy of any arbitrary Python object. There s no way to know in advance how complicated the Python representation will be, so this is a situation where it s ideal to delay the construction of that object until it s actually necessary.

Summary

Characters in a serif font have a proportional width and have serifs A font is proportional when its characters do not all have the same width Most type we read is proportional (including the paragraph typeface for this book) Typically, the uppercase M is the widest character in a proportional font A lowercase i or an exclamation point may be the slimmest Serifs are small strokes added to the beginning or end of a letter s main stroke or strokes Serifs are not merely decoration they were designed to enhance legibility, and it is for this reason that you ll find most books and newspapers set the majority of their text in serif typefaces Examples of common serif typefaces include Times New Roman, Georgia, and Garamond Serif type is sometimes seen as classical, formal, and traditional in nature (although modern serif typefaces certainly exist).

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