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After the class is de ned normally, we register it with the collectionsSequence ABC Registering a class like this makes it a virtual subclass A virtual subclass reports that it is a subclass of the class or classes it is registered with (eg, using isinstance() or issubclass()), but does not inherit any data or methods from any of the classes it is registered with Registering a class like this provides a promise that the class provides the API of the classes it is registered with, but does not provide any guarantee that it will honor its promise One use of metaclasses is to provide both a promise and a guarantee about a class s API Another use is to modify a class in some way (like a class decorator does) And of course, metaclasses can be used for both purposes at the same time Suppose we want to create a group of classes that all provide load() and save() methods We can do this by creating a class that when used as a metaclass, checks that these methods are present:

class LoadableSaveable(type): def __init__(cls, classname, bases, dictionary): super()__init__(classname, bases, dictionary) assert hasattr(cls, "load") and \ isinstance(getattr(cls, "load"), collectionsCallable), ("class '" + classname + "' must provide a load() method") assert hasattr(cls, "save") and \ isinstance(getattr(cls, "save"), collectionsCallable), ("class '" + classname + "' must provide a save() method")

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Digital certi cates provide a more comprehensive form of authentication than passwords For scenarios requiring secure, fast, certi cate-based comis a good choice Certi cates work with mixed munication, security models found on complex intranets, including Windows, UNIX, and third-party LDAP authentication On the Internet, if you need fast, secure server-to-server communication, and you can specify which rewall ports can prove very valuable Using with are open, certi cate authentication combines fast communication and robust security Listing 89 shows a service con guration using transport-level security with certi cate-based client authentication There are a few points worth noting First, the service is con gured to require client certi cates by using in the binding Second, the the node This is server s certi cate is speci ed in the necessary so that the server knows which certi cate and key pair to use in the SSL handshake Third, the service is con gured to bypass verifying the certi cation path of the client s certi cates by specifying PeerTrust as the This is necessary when working with cer, rather than real certi cates obtained or ti cates generated by generated from a trusted authority

Classes that are to serve as metaclasses must inherit from the ultimate metaclass base class, type, or one of its subclasses Note that this class is called when classes that use it are instantiated, in all probability not very often, so the runtime cost is extremely low Notice also that we must perform the checks after the class has been created (using the super() call), since only then will the class s attributes be available in the class itself (The attributes are in the dictionary, but we prefer to work on the actual initialized class when doing checks)

Abstract Commands are the operations that the applications add to the user interface Commands can be added to all Displayables, so they are part of the application when using both high-level or low-level API The most common task for Commands is to provide users with a way to navigate between different Displayables of an application Normally, if there are no Commands in a Displayable, the user has no way to proceed to other Displayables

We could have checked that the load and save attributes are callable using hasattr() to check that they have the __call__ attribute, but we prefer to check whether they are instances of collectionsCallable instead The collectionsCallable abstract base class provides the promise (but no guarantee) that instances of its subclasses (or virtual subclasses) are callable Once the class has been created (using type__new__() or a reimplementation of __new__()), the metaclass is initialized by calling its __init__() method The arguments given to __init__() are cls, the class that s just been created; classname, the class s name (also available from cls__name__); bases, a list of the class s base classes (excluding object, and therefore possibly empty); and dictionary that holds the attributes that became class attributes when the cls class was created, unless we intervened in a reimplementation of the metaclass s __new__() method Here are a couple of interactive examples that show what happens when we create classes using the LoadableSaveable metaclass:

>>> class Bad(metaclass=MetaLoadableSaveable): def some_method(self): pass Traceback (most recent call last): AssertionError: class 'Bad' must provide a load() method

To initiate communication between the client and service, the client must specify a certi cate for authentication This can be done in con guration or in code Listing 810 shows client-side code that attaches a certi cate to the channel for the service to use in authentication Under peer trust, the service will look up the certi cate in its Trusted People folder If found, access will be granted; if not, access will be denied

The metaclass speci es that classes using it must provide certain methods, and when they don t, as in this case, an AssertionError exception is raised

Commands are added to a Displayable using addCommand method There is also removeCommand to remove already-added commands This allows to dynamically change available operations within displayables

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