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The application programmer who coded class Test has expected to see the word green, because the actual argument, a ColoredPoint, has a color eld, and color would seem to be a relevant eld (of course, the documentation for the package Points ought to have been much more precise!) Notice, by the way, that the most speci c method (indeed, the only applicable method) for the method invocation of adopt has a signature that indicates a method of one parameter, and the parameter is of type Point This signature becomes part of the binary representation of class Test produced by the compiler and is used by the method invocation at run time Suppose the programmer reported this software error and the maintainer of the points package decided, after due deliberation, to correct it by adding a method to class ColoredPoint:

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By making collectionsSequence the base class, the isinstance() test will now return True Furthermore, we will be required to implement __init__() (or __new__()), __getitem__(), and __len__() (which we do) The collectionsSequence ABC also provides concrete (ie, nonabstract) implementations for __contains__(), __iter__(), __reversed__(), count(), and index() In the case of SortedList, we reimplement them all, but we could have used the ABC versions if we wanted to, simply by not reimplementing them We cannot make SortedList a subclass of collectionsMutableSequence even though the list is mutable because SortedList does not have all the methods that a collectionsMutableSequence must provide, such as __setitem__() and append() (The code for this SortedList is in SortedListAbcpy We will see an alternative approach to making a SortedList into a collectionsSequence in the Metaclasses subsection) Now that we have seen how to make a custom class t in with the standard ABCs, we will turn to another use of ABCs: to provide an interface promise for our own custom classes We will look at three rather different examples to cover different aspects of creating and using ABCs We will start with a very simple example that shows how to handle readable/writable properties The class is used to represent domestic appliances Every appliance that is created must have a read-only model string and a readable/writable price We also want to ensure that the ABC s __init__() is reimplemented Here s the ABC (from Appliancepy); we have not shown the import

public void adopt(ColoredPoint p) { adopt((Point)p); color = pcolor; }

390

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If the application programmer then runs the old binary le for Test with the new binary le for ColoredPoint, the output is still:

API ()

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cp: (3,3,red)

hash() iter()

Now consider a third compilation unit that uses ColoredPoint:

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All functions, methods, and lambdas bytearray, bytes, dict, frozenset, list, set, str, tuple bytes, frozenset, str, tuple bytearray, bytes, collectionsdeque, dict, frozenset, list, set, str, tuple

because the old binary le for Test still has the descriptor one parameter, whose type is Point; void associated with the method call cpadopt(cp2) If the source code for Test is recompiled, the compiler will then discover that there are now two applicable adopt methods, and that the signature for the more speci c one is one parameter, whose type is ColoredPoint; void ; running the program will then produce the desired output:

iter(), next() len()

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cp: (3,3,green)

==, !=, [], len(), iter(), in, get(), items(), keys(), values() ==, !=, [], del, len(), iter(), in, clear(), get(), items(), keys(), pop(), popitem(), setdefault(), update(), values() [], len(), iter(), reversed(), in, count(), index() [], +=, del, len(), iter(), reversed(), in, append(), count(), extend(), index(), insert(), pop(), remove(), reverse()

public void adopt(Point p) { if (p instanceof ColoredPoint) color = ((ColoredPoint)p)color; x = px; y = py; }

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