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If we attempt to assign to the bar code an AttributeError exception is raised with the error text can t set attribute If we look at the Product class s attributes (eg, using dir()), the only public ones to be found are barcode and description The get_name() and set_name() methods are no longer there they have been replaced with the name property And the variables holding the bar code and description are also private (__barcode and __description), and have been added as slots to minimize the class s memory use This is all done by the AutoSlotProperties metaclass which is implemented in a single method:

class AutoSlotProperties(type): def __new__(mcl, classname, bases, dictionary): slots = list(dictionaryget("__slots__", []))

Listing 812 shows a con guration le generated by svcutil for a service with Windows-based client authentication Note that using the server s Windows credentials are included If the client attempts to initiate secure communication with a service but the service is running under a different Windows account, WCF will throw an error It may be the case that the service account that generated the WSDL in the development environment had one set of credentials, but in production a different Windows account is used In that case, the client-side con guration le must be changed to match the new identity of the service

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for getter_name in [key for key in dictionary if keystartswith("get_")]: if isinstance(dictionary[getter_name], collectionsCallable): name = getter_name[4:] slotsappend("__" + name) getter = dictionarypop(getter_name) setter_name = "set_" + name setter = dictionaryget(setter_name, None) if (setter is not None and isinstance(setter, collectionsCallable)): del dictionary[setter_name] dictionary[name] = property(getter, setter) dictionary["__slots__"] = tuple(slots) return super()__new__(mcl, classname, bases, dictionary)

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Since the MIDP user interface API is highly abstract, it does not dictate any concrete user interaction technique such as softkeys,[4] buttons, or menus An abstract command mechanism allows an application to adjust to the widely varying input mechanisms of MIDP target devices and also allows it to be unaware of device specifics, such as number of keys, key locations, and key bindings Low-level user interactions such as traversal or scrolling are not visible to the application, which helps the devices implement the high-level components in very different user interface styles This also leverages application portability between devices [4] Softkeys are very common in mobile devices Softkey is a keypad key positioned near the device display so that there is an changeable label present on the display that indicates the operation associated with the softkey

A metaclass s __new__() class method is called with the metaclass, and the class name, base classes, and dictionary of the class that is to be created We must use a reimplementation of __new__() rather than __init__() because we want to change the dictionary before the class is created We begin by copying the __slots__ collection, creating an empty one if none is present, and making sure we have a list rather than a tuple so that we can modify it For every attribute in the dictionary we pick out those that begin with "get_" and that are callable, that is, those that are getter methods For each getter we add a private name to the slots to store the corresponding data; for example, given getter get_name() we add __name to the slots We then take a reference to the getter and delete it from the dictionary under its original name (this is done in one go using dictpop()) We do the same for the setter if one is present, and then we create a new dictionary item with the desired property name as its key; for example, if the getter is get_name() the property name is name We set the item s value to be a property with the getter and setter (which might be None) that we have found and removed from the dictionary At the end we replace the original slots with the modi ed slots list which has a private slot for each property that was added, and call on the base class to actually create the class, but using our modi ed dictionary Note that in this case we must pass the metaclass explicitly in the super() call; this is always the case for calls to __new__() because it is a class method and not an instance method For this example we didn t need to write an __init__() method because we have done all the work in __new__(), but it is perfectly possible to reimplement both __new__() and __init__() doing different work in each If we consider hand-cranked drills to be analogous to aggregation and inheritance and electric drills the analog of decorators and descriptors, then metaclasses are at the laser beam end of the scale when it comes to power and.

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