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So the key difference here is what you bind a value to. The values you bind to self are available only to a single object. Values you bind to the class definition are available to all instances of the class. The sharing of class attributes among all instances is a critical distinction, because mutating a class attribute will affect all instances. This may cause unintended side effects if you re not paying attention as a variable may change value on you when you aren t expecting it to. Listing 6-7. >>> other = Foobar() >>> other.somevar 42 >>> other.class_attr 99 >>> # obj and other can have different values for somevar >>> obj.somevar = 77 >>> obj.somevar 77 >>> other.somevar 42 >>> # If we assign to other.class_attr, that makes an instance attribute of other called class_attr. >>> other.class_attr = 66 >>> other.class_attr 66 >>> # And doesn't change the class_attribute class_attr for other objects >>> obj.class_attr 99 >>> # You can still get at the class attribute from other by looking at other.__class__.class_attr >>> other.__class__.class_attr 99 >>> # and if you remove the instance attribute other.class_attr, >>> then other.class_attr goes back to referring to the class attribute >>> del other.class_attr >>> other.class_attr 99 >>> # But if the class_attribute is mutable, when you change it, you change it for every instance >>> Foobar.class_list = [] >>> obj.class_list [] >>> other.class_list [] >>> obj.class_list.append(1) vb.net ean 128 reader Packages matching GS1-128 - NuGet Gallery
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VB . NET GS1-128 Generator for .NET class, Data Matrix, PDF417, QRCode, Code128, Code39. >>> obj.class_list [1] >>> other.class_list [1] We think it s important to stress just how transparent Jython s object system really is. Object attributes are just stored in a plain Jython dictionary. You can directly access this dictionary by looking at the __dict__ attribute. Listing 6-8. >>> obj = Foobar() >>> obj.__dict__ {'somevar': 42} Notice that there are no references to the methods of the class (in this case, just our initializer), or the class attribute class_attr . The __dict__ only shows the local attributes and methods of the object. We ll cover inheritance shortly, and you ll see how attributes and methods are looked up in the case where you specialize classes through subclassing. The same trick can be used to inspect all the attributes of the class, just look into the __dict__ attribute of the class definition and you ll find your class attributes and all the methods that are attached to your class definition: Listing 6-9. >>> Foobar.__dict__ {'__module__': '__main__', 'class_attr': 99, '__dict__': <attribute '__dict__' of 'Foobar' objects>, '__init__': <function __init__ at 1>} This transparency can be leveraged with dynamic programming techniques using closures and binding new functions into your class definition at runtime. We ll revisit this later in the chapter when we look at generating functions dynamically and finally with a short introduction to metaprogramming. vb.net ean 128 reader GS1 128 Generator DLL in VB | Free . NET program sample code ...
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