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Objektorientierte Programmierung. Das Python3. Was ist Python? Python - Objektorientierte Programmierung ; Hat einen Radius Programmiersprache Python. Seite 3. Aufbau class clsKreis object :. Objektorientierte Programmierung in Python — Klassen, Objekte Wir haben uns in dem Kapitel angesehen, wie man in Python objektorientiert programmiert. Python hat diverse Dinge bei der objektorientierten Programmierer dazu Objektorientierte Programmierung - grimm-jaud.
NewStyle NewStyle2. Python 3. For this purpose, we would like to draw your attention to a public library. If it helps, you can imagine the libraries in Paris, Berlin, Ottawa or Toronto1 as well. Each of these contain an organized collection of books, periodicals, newspapers, audiobooks, films and so on.
Generally, there are two opposed ways of keeping the stock in a library. You can use a "closed access" method that is the stock is not displayed on open shelves. In this system, trained staff brings the books and other publications to the users on demand. Another way of running a library is open-access shelving, also known as "open shelves". In this case the books are openly displayed. Imperative languages like C could be seen as open-access shelving libraries. The user can do everything.
It's up to the user to find the books and to put them back at the right shelf. Even though this is great for the user, it might lead to serious problems in the long run. For example some books will be misplaced, so it's hard to find them again.
As you may have guessed already, "closed access" can be compared to object oriented programming.
The analogy can be seen like this: The books and other publications, which a library offers, are like the data in an object-oriented program. Access to the books is restricted like access to the data is restricted in OOP. Getting or returning a book is only possible via the staff. The staff functions like the methods in OOP, which control the access to the data.
So, the data, - often called attributes, - in such a program can be seen as being hidden and protected by a shell, and it can only be accessed by special functions, usually called methods in the OOP context.
Putting the data behind a "shell" is called Encapsulation. So a library can be regarded as a class and a book is an instance or an object of this class.
Generally speaking, an object is defined by a class. A class is a formal description of how an object is designed, i. These objects are called instances as well.
The expressions are in most cases used synonymously. A class should not be confused with an object. OOP in Python First-class Everything Even though we haven't talked about classes and object orientation in previous chapters, we have worked with classes all the time.
In fact, everything is a class in Python. Guido van Rossum has designed the language according to the principle "first-class everything".
He wrote: "One of my goals for Python was to make it so that all objects were "first class. That is, they can be assigned to variables, placed in lists, stored in dictionaries, passed as arguments, and so forth.
Each of these are instances of their corresponding classes. In simplified terms, we have said so far that "x and y are lists". We will use the terms "object" and "instance" synonymously in the following chapters, as it is often done.
We will not explain how Python has implemented lists internally. We don't need this information, because the list class provides us with all the necessary methods to access the data indirectly. This means that the encapsulation details are encapsulated. We will learn about encapsulation later. A Minimal Class in Python We will design and use a robot class in Python as an example to demonstrate the most important terms and ideas of object orientation.
We will start with the simplest class in Python.
The header usually consists of just one line of code. It begins with the keyword "class" followed by a blank and an arbitrary name for the class. The class name is "Robot" in our case. The class name is followed by a listing of other class names, which are classes from which the defined class inherits from. These classes are called superclasses, base classes or sometimes parent classes. If you look at our example, you will see that this listing of superclasses is not obligatory. You don't have to bother about inheritance and superclasses for the time being.
We will introduce them later. The body of a class consists of an indented block of statements.
In our case a single statement, the "pass" statement. A class object is created, when the definition is left normally, i.
This is basically a wrapper around the contents of the namespace created by the class definition. Besides this, we have created a reference y2 to y, i. Objektorientierte Programmierung mit Python. Python 3 - Lernen und professionell anwenden Das Buch behandelt die Grundlagen von Python 3 Version 3. Die objektorientierte Sprache Python eignet sich hervorragend zum Bibliotheksmodule, objektorientierte Programmierung.
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