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Readability counts. It s mentioned specifically in the Zen of Python, as noted earlier, and is perhaps one of the most important features of Python. Indeed, many Python programmers take pride in the readability of both the language and the code they write. The idea is that code is read far more often than it s written, especially in the world of open source. To this end, Python as a language provides a number of features designed to improve readability. For instance, its minimal use of punctuation and forced indentation allow the language itself to help maintain the readability of your code. When you re working with code in the real world, however, there s far more to consider. For real life, the Python community has developed a set of guidelines for writing code, intended to improve readability. Set forth in PEP-8,2 these guidelines are designed to maintain not only readability of an individual program, but also consistency across multiple programs. Once you get the feel for one well-written program, you ll be able to easily understand others. The exact details of PEP-8 are too numerous to list here, so be sure to read it thoroughly to get a good idea for how to write good code. Also, note that if you read Django s own source code, some of the rules set forth in PEP-8 aren t followed. Ironically, this is still in the interest of readability, as certain situations would suffer unnecessarily if every last rule was followed. After all, to quote the Zen of Python again, Practicality beats purity. The examples in this book will follow the style used by Django s own source code.

Unfortunately, serialization can become a fair bit more complicated than the RichLabel example. One such case is the RestrictedCalendar control demonstrated in the previous chapter. The

RestrictedCalendar stores a collection of dates the user isn t allowed to select in a NonSelectableDates property. Ordinarily, you would deal with the serialization of the NonSelectableDates property by adding the attributes shown here: [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)] [PersistenceMode(PersistenceMode.InnerProperty)] public DateTimeCollection NonSelectableDates { get {return (DateTimeCollection)ViewState["NonSelectableDates"];} set {ViewState["NonSelectableDates"] = value;} } Everything seems fine at first. In fact, you don t even need to create a type converter for the NonSelectableDates property. That s because .NET automatically recognizes it as a collection and uses the CollectionConverter. The CollectionConverter simply displays the text (Collection), as shown in Figure 28-7.

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Figure 28-7. A collection property You can click the ellipsis next to the property name to open a designer where you can add DateTime objects. You can even choose values for each date using a drop-down calendar, as shown in Figure 28-8. This graphical functionality is actually the work of another component, called a type editor. (You ll learn about type editors in the next section.) This all works well enough. If you look at the generated HTML for the RestrictedCalendar after you add two dates, you ll see something like this: <cc1:RestrictedCalendar id="RestrictedCalendar8" runat="server"> <NonSelectableDates> <System.DateTime Year="2004" DayOfWeek="Friday" Second="0" Minute="0" TimeOfDay="00:00:00" Day="20" Millisecond="0" Date="2004-08-20" Hour="0" DayOfYear="233" Ticks="632285568000000000" Month="8"></System.DateTime> <System.DateTime Year="2004" DayOfWeek="Saturday" Second="0" Minute="0" TimeOfDay="00:00:00" Day="21" Millisecond="0" Date="2004-08-21" Hour="0" DayOfYear="234" Ticks="632286432000000000" Month="8"></System.DateTime> </NonSelectableDates> </cc1:RestrictedCalendar>

Figure 28-8. Adding dates to a collection property This code raises two problems. First, there s more information there than you really need to store. The RestrictedCalendar is interested only in the date portion of the DateTime object, and the time information is wasted space. A more serious problem is that when you request this page, ASP .NET won t be able to re-create the DateTimeCollection that s exposed by the NonSelectableDates property. Instead, it will raise an error when attempting to deserialize the nested tags and set read-only properties such as Year, Month, and Ticks. To solve this problem, you need to plug into the serialization and parsing infrastructure for your control. The first step is to customize the code that s serialized for each DateTime object in the NonSelectableDates collection. To accomplish this, you need to create a new class called a control designer. Control designers are complex components that can perform a whole variety of designtime services, including generating HTML for a design-time representation and providing services for entering and editing templates at design time. In this case, you re interested in only one aspect of the control designer its ability to control how the content inside the control tag is serialized. To accomplish this, you create a class that inherits from ControlDesigner, and you override the GetPersistenceContent() method. This method will read the list of restricted dates and create a new tag for each DateTime object. This tag will then be added into the RestrictedCalendar control tag. Here s the complete code: public class RestrictedCalendarDesigner : ControlDesigner { public override string GetPersistenceContent() { StringWriter sw = new StringWriter(); HtmlTextWriter html = new HtmlTextWriter(sw); RestrictedCalendar calendar = this.Component as RestrictedCalendar; if (calendar != null) { // Create tags in the format:

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