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Python Classes and Objects. A Basic Introduction. Coming up: Topics. 1. Topics. Objects and Classes. Abstraction . Encapsulation . Messages . What are objects. An object is a datatype that stores data, but ALSO has operations defined to act on the data. It knows stuff and can do stuff. Generally represent: .
In fact, programming in Python is typically done in an object oriented fashion. Defining a Class. A class is a special data type which defines how to build a certain kind of object. The class also stores some data items that are shared by all the instances of this class.
CHAPTER 1. About this Book. This book is prepared from the training notes of Anand Chitipothu. Anand conducts Python training classes on a semi-regular basis in Bangalore, India. Checkout out the upcoming trainings if you are interested. CHAPTER 2. Table of Contents. Getting Started. Running Python Interpreter.
Creang,Classes, 5 • Defining a class in Python is done using the class keyword, followed by an indented block with the class contents. class <Classname>: data1 = value1... dataM = valueM def <function1>(self,arg1,...,argK): <block>... def <functionN>(self,arg1,...,argK): <block> General Format Class data attributes Class member functions
• Implement and test behavior of each class separately • Increased modularity reduces complexity Classes make it easy to reuse code • Many Python modules define new classes • Each class has a separate environment (no collision on function names) • Inheritance allows subclasses to redefine or extend a selected subset of a superclass ...
All classes in Python must have the following components: 1. List of instance variables – these are the components that make up the object. (In our previous example these are name, age, phone number and birthday.) 2. A constructor – this is a method (functions that are inside of classes are called methods) that
Definition of a Class. A class is a specification (or blueprint) of an object’s structure and behavior. Definition of an Object. An object is an instance of a class. From Collections of Objects to Classes: Generation of Objects from Class Specifications:
