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The only method we need to pay attention to in particular here is the __getitem__ method. This method is called whenever we try to get an item.


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python __getitem__ slice

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The __contains__() method is used to implement the in operator. The slicing operations such as x = s [i:j] are also implemented using __getitem__ ().


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def __getitem__(self: _UST, i: int) -> _UST: # type: ignore. @overload. def __​getitem__(self: _UST, s: slice) -> _UST: def __getitem__(self: _UST, s: slice).


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Below is an example using slicing to get the installed Python version (copied from class A(object): def __getitem__(self, key): print key.


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__getitem__(i) is called. You can implement __getitem__ method in your class, and define the behaviour of slicing. Example: class Foo: def.


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All data in a Python program is represented by objects or by relations between objects. (In a sense, and in Slice objects are used to represent slices for __​getitem__() methods. They are also created equivalent to type(x).__getitem__(​x, i).


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The t[] expression makes use of Python's slice syntax. It is equivalent to this expression: t[slice(5, , 10)]. The. The __getitem__ magic method is.


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In Py, __getitem__ conveniently supports slices for builtin sequences: 'abcde'.​__getitem__(slice(2,4)) For user defined classes to emulate.


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In Py, __getitem__ conveniently supports slices for builtin sequences: 'abcde'.​__getitem__(slice(2,4)) For user defined classes to emulate.


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It is equivalent to this expression: t[slice 5, , 10 ]. Prerequisites A basic familiarity with Tkinter copy. Prerequisites copy. If you're not careful about how you manage your references, these tag objects might keep accumulating throughout the duration of your program, leading to massive memory usage. The resulting code not only looks niftier, but the nested structure of it helps you to visualize the GUI that you'll get when you run this code! It's great! Tkinter is the default GUI toolkit for Python. But after the HTML has been generated, or the widgets have been created, your tag objects have lost their usefulness. But we're going to tweak things a bit so that you can create your own "custom" tags. The temptation can be great, but remember that the more abstraction you have, the leakier it can get. Copying objects uses a lot of memory You might have noticed that we used the copy. The wrapper library can help you reduce line count and increase clarity. Getting Started There are far more magic methods in Python than we could ever hope to cover. But using magic methods, we can rectify this sad state of affairs! You may be surprised that t[1, 'b', 3. The t[] expression makes use of Python's slice syntax. For example, a method that needs to record its arguments every time it is invoked. The code is flat and doesn't give you any visual clues concerning the appearance of the resulting GUI. Unlike some other languages, Python basically lets you pass any object into the indexer. If you fine-grained control of member assignment, you are almost always better off using properties instead. OK, now that that's out of the way, we can move on. Here's an example of a basic GUI built using Tkinter:. Considering how versatile it is, it's probably one of Python's most underutilized magic methods. You might have noticed that we used the copy. Pyparsing allows you to use Python's arithmetic operators to define the relationships between the tokens. One of the things you might have observed while reading the example above is that doing layout in Tkinter is repetitive and no fun. So let's use it! Callable objects are also a good way to implement partial functions, though they're not as useful for that since Python 2. Exercises Go Back.{/INSERTKEYS}{/PARAGRAPH} Most approaches to HTML generation involve string interpolation or the use of a template language. Pyparsing provides is a parsing library for simple grammars. Generally, operator overloading is most useful when dealing with numerical types or types which are collections of numeric data. Magic Method Caveats Too much magic is not good We believe that magic methods are an awesome tool for creating wrapper libraries for commonly-used libraries that have cumbersome APIs. Steps Tkinter 0 Tkinter 1 Tkinter 2. Operator overloading Pyparsing provides is a parsing library for simple grammars. {PARAGRAPH}{INSERTKEYS}There are far more magic methods in Python than we could ever hope to cover. I know you're thinking it, so I'll just go ahead and blurt it out: "Man, Tkinter is ugly". Pyparsing is an unorthodox use of operator overloading. Well, it's not great, per se, but it ships with Python, so it's probably sitting on your system somewhere, ready to be used. However, be careful not to abstract the underlying interface too much. It's common to create a lot of objects when using these kinds of techniques. As you can see, the 1, 'b', 3. To the Python interpreter, that expression is equivalent to this: t. If you're into that sort of thing We believe that magic methods are an awesome tool for creating wrapper libraries for commonly-used libraries that have cumbersome APIs. However, we believe that the arithmetic and boolean magic methods are fairly intuitive to use, and so don't deserve special attention. Because you end up writing the following statement an awful lot: object. The only difference is that invoking it doesn't require a name, just the parentheses.