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In Python, you should always use the EAFP style, rather than LBYL, wherever possible Listing 10-15 compares simple examples of the LBYL and EAFP programming styles Listing 10-15 LBYL Programming vs EAFP Programming # LBYL: not Pythonic if hasattr(some object, 'result'): return some objectresult() else: return None # EAFP: Pythonic try: return some objectresult() except AttributeError: return None To people used to looking before they leap, Python s approach can feel dangerous: LBYL is a very risk-averse strategy and implicitly perceives exceptions as risks But exceptions in Python aren t risks; they re just another part of the language, and so EAFP is entirely suitable in that context Of course, you have to be careful to keep your error handling tight: in the EAFP example in Listing 10-15, if some object.

WebClient webClient = new WebClient(); // Wire up the download string completed event webClientDownloadStringCompleted += new DownloadStringCompletedEventHandler(webClient_DownloadStringCompleted); webClientDownloadStringAsync(uri); } void webClient_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e) { // retrieve the message results string message = eResult; } This asynchronous network pattern is not limited to just the developer Internally the Silverlight framework respects this pattern All application assets and assemblies are brought down to the client using asynchronous patterns Furthermore, when Silverlight is used to stream media elements, those bits are brought down on secondary threads as well This improves the performance of launching and the overall experience of a Silverlight application Initially, many developers thought it was overkill that Microsoft forced developers to use asynchronous network patterns everywhere Many developers prefer to have the choice how to implement network requests.

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The child elements of the <property> element are as follows: (meta*, (column | formula)*, type ) Any element accepting a column attribute, as is the case for the <property> element, will also accept <column> elements in its place. For an example, see Listing 7-2. Listing 7-2. Using the <column> Element <property name="message"/> <column name="message" type="string"/> </property> This particular example does not really give us anything beyond the use of the column attribute directly; but the <column> element comes into its own with custom types and some of the more complex mappings that we will be looking into later in the chapter.

While I agree having more choice is always good, in this case, Silverlight applications simply will always have to follow best practices This prevents developers from releasing an application that is rushed or coded lazily Consider the numerous applications for the iPhone The iPhone SDK gives developers a choice to create synchronous or asynchronous network requests I have an iPhone 3G and I get annoyed when my entire phone locks up because a developer is making an expensive network request in their loading screen Even though Apple strongly recommends creating network requests asynchronously, some developers simply do not follow that pattern No doubt if Microsoft gave developers a choice, the same would happen on the Silverlight platform Some developers would release applications that locked the entire browser and this could give Silverlight a bad name in the RIA space.

result() were itself to raise an exception, then handling all exceptions of class Exception would mean your program is ignorant to any problems occurring inside that method As it is, an AttributeError from deep within the result() method will be ignored in the example To program in a Pythonic way is to follow a number of different interlocking conventions EAFP itself isn t an important one, but it embodies many of the other Pythonic conventions These are summarized online in the Pythonic Enhancement Proposal 8 (PEP 0008) and are a subject of much discussion among the larger Python community Pythonic conventions are to be encouraged among Python programmers, and many of these have reasons that go to the heart of Python s core principles.

Retrieving data asynchronously over the network is technically not really true multithreading However, it is important to note that the multithreading concepts apply even when using the networking communication stack The asynchronous callback pattern is similar to other multithreaded techniques Furthermore, in order to guarantee that network callbacks are resolved on the main application, thread marshaling is required..

The <component> element is used to map classes that will be represented as extra columns within a table describing some other class. We have already discussed how components fit in as a compromise between full entity types and mere value types. The <component> element can take the attributes listed in Table 7-7. Table 7-7. The <component> Attributes

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