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Listing 6-10. class Animal(object): def sound(self): return "I don't make any sounds" class Goat(Animal): def sound(self): return "Bleeattt!" class Rabbit(Animal): def jump(self): return "hippity hop hippity hop" class Jackalope(Goat, Rabbit): pass Now you should be able to explore that module with the jython interpreter: Listing 6-11. >>> from animals import * >>> animal = Animal() >>> goat = Goat() >>> rabbit = Rabbit() >>> jack = Jackalope() >>> animal.sound() "I don't make any sounds" >>> animal.jump() Traceback (most recent call last): File "<stdin>", line 1, in <module> AttributeError: 'Animal' object has no attribute 'jump' >>> rabbit.sound() "I don't make any sounds" >>> rabbit.jump() 'hippity hop hippity hop' >>> goat.sound() 'Bleeattt!' >>> goat.jump() Traceback (most recent call last): File "<stdin>", line 1, in <module> AttributeError: 'Goat' object has no attribute 'jump' >>> jack.jump() 'hippity hop hippity hop' >>> jack.sound() 'Bleeattt!' Inheritance is a very simple concept, when you declare your class, you simply specify which parent classes you would like to reuse. Your new class can then automatically access all the methods and attributes of the super class. In this example, the Goat object has no method jump, and its super class Animal has no method jump, so the attempt to invoke the jump method fails. Invoking the sound method on the rabbit actually calls the super class s sound method. This is the key idea: if an attribute lookup fails on the local object instance, the lookup is then propagated up the inheritance tree to the super class. Notice how the Jackalope had access to methods from both the rabbit and the goat because it can use two super classes to resolve methods. vb.net code 39 reader VB . NET Image: Example to Read Code 39 Barcode with VB . NET Codes in ...
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Free to download .NET, C#, VB . NET barcode reader app for Code 39 ; C# Code 39 recognition SDK; VB . NET Code 39 recognition SDK. Listing 7-2. SQL for the Union of Two Compatible Tables SELECT * FROM ClubA UNION SELECT * FROM ClubB With single inheritance when your class simply inherits from one parent class the rules for resolving where to find an attribute or a method are very straightforward. Jython just looks up to the parent if the current object doesn t have a matching attribute. It s important to point out now that the Rabbit class is a type of Animal: the Jython runtime can tell you that programmatically by using the isinstance function: Listing 6-12. >>> isinstance(bunny, Rabbit) True >>> isinstance(bunny, Animal) True >>> isinstance(bunny, Goat) False For many classes, you may want to extend the behavior of the parent class instead of just completely overriding it. For this, you ll want to use the super() function. Let s specialize the Rabbit class like this: word qr code generator, birt pdf 417, upc barcode font for microsoft word, birt code 128, qr code birt free, word pdf 417 vb.net code 39 reader read code 39 barcode with vb . net - Stack Overflow
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NET Code 39 Barcode Reader , Reading Code - 39 barcode images in .NET, C#, VB . NET , ASP.NET applications. Listing 6-13. class EasterBunny(Rabbit): def sound(self): orig = super(EasterBunny, self).sound() return "%s - but I have eggs!" % orig If you now try making this rabbit speak, it will extend the original sound() method from the base Rabbit class. Calling the super() function lets you access the super class s implementation of the sound method. In this example, it s useful because the EasterBunny class is reusing and extending the basic Rabbit class s sound() method. Listing 6-14. >>> bunny = EasterBunny() >>> bunny.sound() "I don't make any sounds - but I have eggs!" That wasn t so bad. For these examples, we only demonstrated that inherited methods can be invoked, but you can do exactly the same thing with attributes that are bound to the self. For multiple inheritance, things get complicated quickly. Jython uses left first, depth first search to resolve attribute lookups. In a nutshell, if you were to draw your inheritance diagram, Jython would look down the left side of your graph looking for attributes going from the bottom up, left to right. If any super class is inherited by two or more subclasses, then the super class is used for lookup only after all attribute lookups have been exhausted on the subclasses. vb.net code 39 reader Visual Studio . NET Barcode Scanner Library API for . NET Barcode ...
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