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When an Image is created, the user (ie, the class s user) must provide a width and height, but the lename and background color are optional since defaults are provided The self__data dictionary s keys are (x, y) coordinates and its values are color strings The self__colors set is initialized with the background color; it is used to keep track of the unique colors used by the image All the data attributes are private except for the lename, so we must provide a means by which users of the class can access them This is easily done using properties

reduces throughput, it facilitates scenarios in which state is shared across all callers where no adequate locking mechanism exists

One of the fundamental features of any programming language is its logical operations Python provides four sets of logical operations, and we will review the fundamentals of all of them here

There are two basic types of timers in MIDP: one-shot timers and repeating timers The key difference between these two types of timers is the scheduling approach A one-shot timer executes the specified task only once A repeating timer continues executing the specified task repeatedly at a specific interval

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Since all Python variables are really object references, it sometimes makes sense to ask whether two or more object references are referring to the same object The is operator is a binary operator that returns True if its left-hand object reference is referring to the same object as its right-hand object reference Here are some examples:

>>> a >>> b >>> a False >>> b >>> a True = ["Retention", 3, None] = ["Retention", 3, None] is b = a is b

To create a single service instance that is single threaded, should be used in conjunction with The setting indicates that only one instance should be created, whereas the setting directs WCF to execute that instance on only one thread at a time These settings direct WCF to dispatch all requests in (FIFO) order Listing 54 shows the service code using and behaviors

Note that it usually does not make sense to use is for comparing ints, strs, and most other data types since we almost invariably want to compare their values In fact, using is to compare data items can lead to unintuitive results, as we can see in the preceding example, where although a and b are initially set to the same list values, the lists themselves are held as separate list objects and so is returns False the rst time we use it One bene t of identity comparisons is that they are very fast This is because the objects referred to do not have to be examined themselves The is operator needs to compare only the memory addresses of the objects the same address means the same object The most common use case for is is to compare a data item with the built-in null object, None, which is often used as a place-marking value to signify unknown or nonexistent :

Timers can be used by a MIDlet in both the Active and Paused states, although use in the Paused state is discouraged

>>> a = "Something" >>> b = None >>> a is not None, b is None (True, True)

To invert the identity test we use is not The purpose of the identity operator is to see whether two object references refer to the same object, or to see whether an object is None If we want to compare object values we should use a comparison operator instead

Figure 54 shows the output from the client (left) and service (right) The client sends three asynchronous requests, but note that the service processes only one request every ve seconds The service output shows that only one instance of the service class was created It also shows that setting some requests reused a thread The directed WCF to spin up only one instance of the service class, whereas the setting directed WCF to allow only one thread at doesn t a time to execute that instance Note that control how many threads are created in the service; it just speci es that only one should run through each instance

Python provides the standard set of binary comparison operators, with the expected semantics: < less than, <= less than or equal to, == equal to, != not

A one-shot timer can be set up to execute a task in two different ways In the first approach, a javautilDate object is passed into the schedule method of the Timer object When the time specified by the Date object occurs, the timer

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