Pythonclass
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This document discusses classes and objects in Python. It defines what a class and object are, how to create classes and objects in Python, and provides an example Employee class with two employee objects. A class defines the blueprint for an object, containing attributes and methods. An object is an instance of a class. To create a class in Python, the class keyword is used followed by the class name and contents in a suite. Objects are created by calling the class and passing arguments to its __init__ method. Methods can then be accessed using dot notation on the object.
Pythonclass
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- 4. Classes and Objects In Python ● Shafeeque ● [email protected] ● www.facebook.com/shafeequemonp pambodan ● twitter.com/shafeequemonp ● in.linkedin.com/in/shafeequemonp ● 9809611325
- 5. What is a Class? A class is simply a representation of a type of object. It is the blueprint/ plan/ template that describe the details of an object. A class is the blueprint from which the individual objects are created. Class is composed of three things: a name, attributes, and operations. i.e. it can be executed from as many different points in Program as required What is an Object? ● An object represents a particular instance of a class. ● An Object is a collection of data members and associated member functions also known as methods.
- 6. Class declaration: Syntax: Cpp: class class_name {}; class class_name { access_specifier_1://public/private/protected member1;//member variables//member functions access_specifier_2: member2; ... } object_names; Class definition: Eg:class CRectangle { int x, y; public: void set_values (int,int); int area (void); } Class object: class_name object_name Eg:CRectangle rect; rect.x;or rect.set_values();
- 7. Class declaration: java: class class_name {} public class Dog { String breed; int age; String color; void barking() { } void hungry() { } void sleeping() { } } Class object: Dog dog=new Dog(); Using object: objectReference.methodName(); Here, dog.barking(); dog.hungry();
- 8. Python classes and objects: Creating Classes: Syntax: class ClassName: 'Optional class documentation string' class_suite ● The class has a documentation string which can be access via ClassName.__doc__. ● The class_suite consists of all the component statements, defining class members, data attributes, and functions. Creating and accessing instance objects: ● To create instances of a class, you call the class using class name and pass in whatever arguments its __init__ method accepts ● Object name=Class_name() ● Eg:class=Class() accessing:objectname.method()
- 9. class Employee: 'Common base class for all employees' def __init__(self, name, salary): self.name = name self.salary = salary def displayEmployee(self): print "Name : ", self.name, ", Salary: ", self.salary "This would create first object of Employee class" emp1 = Employee("shafeeque", 2000) "This would create second object of Employee class" emp2 = Employee("shameer", 5000) emp1.displayEmployee() emp2.displayEmployee() Name : shafeeque ,Salary: 2000 Name : shameer ,Salary: 5000
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