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Using this syntax keeps context managers and the variables they are associated with together, making the with statement much more readable than if we were to nest them or to use contextlibnested() It isn t only le objects that are context managers For example, several threading-related classes used for locking are context managers Context managers can also be used with decimalDecimal numbers; this is useful if we want to perform some calculations with certain settings (such as a particular precision) in effect If we want to create a custom context manager we must create a class that provides two methods: __enter__() and __exit__() Whenever a with statement is used on an instance of such a class, the __enter__() method is called and the return value is used for the as variable (or thrown away if there isn t one) When control leaves the scope of the with statement the __exit__() method is called (with details of an exception if one has occurred passed as arguments) Suppose we want to perform several operations on a list in an atomic manner that is, we either want all the operations to be done or none of them so that the resultant list is always in a known state For example, if we have a list of integers and want to append an integer, delete an integer, and change a couple of integers, all as a single operation, we could write code like this:

try: with AtomicList(items) as atomic: atomicappend(58289) del atomic[3] atomic[8] = 81738 atomic[index] = 38172 except (AttributeError, IndexError, ValueError) as err: print("no changes applied:", err)

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[ Team LiB ]

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If no exception occurs, all the operations are applied to the original list (items), but if an exception occurs, no changes are made at all Here is the code for the AtomicList context manager:

class AtomicList: def __init__(self, alist, shallow_copy=True):

selforiginal = alist selfshallow_copy = shallow_copy def __enter__(self): selfmodified = (selforiginal[:] if selfshallow_copy else copydeepcopy(selforiginal)) return selfmodified def __exit__(self, exc_type, exc_val, exc_tb): if exc_type is None: selforiginal[:] = selfmodified

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In light of the wide variations in cellular phones and other MIDP target devices, the requirements for user interface support are very challenging MIDP target devices differ from desktop systems in many ways, especially in how the user interacts with them The following UI-related requirements were seen as important when the user interface library of the MIDP Specification was designed: The devices and applications should be useful to users who are not necessarily experts in using computers

performance, manageability, and security If you already have IIS running in your environment, you already have security practices in place Sophisticated IT shops often de ne explicit policies and procedures for security and have automated tools for verifying compliance Smaller shops often use the implicit security built in to IIS and Windows 2003 In either case, existing security practices would be applied to IIS-hosted WCF services But there are also reasons to not use IIS for hosting You may not want to use HTTP as the protocol You may want explicit control of the startup and shutdown events Or you may want to provide a custom administration interface rather than using the IIS tools If you don t want to use IIS for hosting, this is no problem WCF makes self-hosting very easy and exible Selfhosting is the term used to describe a hosting method where the developer instantiates the service host, rather than relying on IIS or Windows Process Activation Services (WAS) The simplest way of hosting a service is to write a console application, as shown in Listing 11 This isn t too useful in production because having command windows on a server isn t a great practice, but for getting started, it eliminates all dependencies on IIS infrastructure The main program cre, which, as the name implies, will host ates a new instance of method on the and the service The program calls the then continues about its business In this case, there s nothing to do except wait for someone to press Enter, at which point the application calls the method on the ServiceHost is called, the listens on the addresses speci ed After does a few by the endpoints When messages arrive, the things First, based on the channel stack de ned by the binding, it applies any decryption, decompression, and security rules Second, based on the contract, it deserializes the incoming message into NET types, creates a new object, and then invokes the proper operation on the object.

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