Python 3 Object Oriented Programming

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Learn the fundamentals of object-oriented programming: classes, objects, methods, inheritance, polymorphism, and others! You also accept that you are aware that your data will be stored outside of the EU and that you are above the age of Object-oriented programming OOP is a powerful programming paradigm that reduces the complexity of systems as is employs heavy re-usability of code. OOP leverages the concept of objects and classes. Objects may contain data known as attributes, stored as instance or class variables as well as procedures defined as methods.

Objects are generated from blueprints known as classes, which specify the attributes and methods to be generated at the time of object instantiation. This course introduces the internals of classes and the utilization of objects, as well as important object-oriented programming fundamentals such as inheritance, polymorphism, and composition. In this chapter we quickly review functions and data structures, as they are building blocks of object-oriented programming.

Python 3 for Beginners - Python 3 Programming - Object Oriented Programming in Python3 - Eduonix

Then we transition into the conceptual definition of objects and classes. We create fancier classes with sophisticated methods such as importing datasets, getting descriptive statistics, and renaming columns.

Also, we cover best practices for creating and documenting classes according to PEP Here, we dive deep into the internals of classes, instantiation of objects, the initialization method, instance variables, class variables, overriding class variables, and methods. In this chapter we cover inheritance, which is when we create a class that employs or 'inherits' all class variables and methods from a 'parent' class. We also cover polymorphism, which is when multiple classes inherit from a single class.

Finally, we cover composition, which is when classes employ specific class functionality from other classes without necessarily inheriting from them. Vicki is a senior consultant in machine learning and engineering and works with clients to build holistic data products used for decision-making. In all the programs we wrote till now, we have designed our program around functions i. This is called the procedure-oriented way of programming.

There is another way of organizing your program which is to combine data and functionality and wrap it inside something called an object. This is called the object oriented programming paradigm. Most of the time you can use procedural programming, but when writing large programs or have a problem that is better suited to this method, you can use object oriented programming techniques. Classes and objects are the two main aspects of object oriented programming. A class creates a new type where objects are instances of the class. An analogy is that you can have variables of type int which translates to saying that variables that store integers are variables which are instances objects of the int class.

Note that even integers are treated as objects of the int class. Objects can store data using ordinary variables that belong to the object. Variables that belong to an object or class are referred to as fields.

Python Object Oriented Programming

Objects can also have functionality by using functions that belong to a class. Such functions are called methods of the class. This terminology is important because it helps us to differentiate between functions and variables which are independent and those which belong to a class or object. Collectively, the fields and methods can be referred to as the attributes of that class. They are called instance variables and class variables respectively.


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A class is created using the class keyword. The fields and methods of the class are listed in an indented block. Class methods have only one specific difference from ordinary functions - they must have an extra first name that has to be added to the beginning of the parameter list, but you do not give a value for this parameter when you call the method, Python will provide it.

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This particular variable refers to the object itself , and by convention, it is given the name self. Although, you can give any name for this parameter, it is strongly recommended that you use the name self - any other name is definitely frowned upon. There are many advantages to using a standard name - any reader of your program will immediately recognize it and even specialized IDEs Integrated Development Environments can help you if you use self.

You must be wondering how Python gives the value for self and why you don't need to give a value for it. An example will make this clear. Say you have a class called MyClass and an instance of this class called myobject.

New to OOP? Learn how to write a class and create instances in Python

When you call a method of this object as myobject. This also means that if you have a method which takes no arguments, then you still have to have one argument - the self. We create a new class using the class statement and the name of the class. This is followed by an indented block of statements which form the body of the class.

In this case, we have an empty block which is indicated using the pass statement. We will learn more about instantiation in the next section. For our verification, we confirm the type of the variable by simply printing it. Notice that the address of the computer memory where your object is stored is also printed. The address will have a different value on your computer since Python can store the object wherever it finds space. Here we see the self in action.

There are many method names which have special significance in Python classes. The method is useful to do any initialization i. Notice the double underscores both at the beginning and at the end of the name. Here, we just create a new field also called name.

Object Oriented Programming

Notice these are two different variables even though they are both called 'name'. There is no problem because the dotted notation self. Since we explicitly indicate which name we are referring to, there is no confusion. This is the special significance of this method. Now, we are able to use the self. We have already discussed the functionality part of classes and objects i.

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The data part, i. This means that these names are valid within the context of these classes and objects only. That's why they are called name spaces. There are two types of fields - class variables and object variables which are classified depending on whether the class or the object owns the variables respectively. Class variables are shared - they can be accessed by all instances of that class. There is only one copy of the class variable and when any one object makes a change to a class variable, that change will be seen by all the other instances.

In this case, each object has its own copy of the field i. This is a long example but helps demonstrate the nature of class and object variables. Here, population belongs to the Robot class and hence is a class variable.

http://vpn745846014.softether.net/the-worst-book-ever-written.php The name variable belongs to the object it is assigned using self and hence is an object variable. Thus, we refer to the population class variable as Robot.

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We refer to the object variable name using self. Remember this simple difference between class and object variables. Also note that an object variable with the same name as a class variable will hide the class variable! Instead of Robot. This means we can define it as either a classmethod or a staticmethod depending on whether we need to know which class we are part of.

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