Using the python language, create your own unique class, show the initialization method and create about three objects of that class

You access the object's attributes using the dot operator with object. Class variable would be accessed using class name as follows −

emp1.displayEmployee()

emp2.displayEmployee()

print "Total Employee %d" % Employee.empCount

Now, putting all the concepts together −

Live Demo

#!/usr/bin/python

class Employee:

  'Common base class for all employees'

  empCount = 0

  def __init__(self, name, salary):

     self.name = name

     self.salary = salary

     Employee.empCount += 1

  def displayCount(self):

    print "Total Employee %d" % Employee.empCount

  def displayEmployee(self):

     print "Name : ", self.name,  ", Salary: ", self.salary

"This would create first object of Employee class"

emp1 = Employee("Zara", 2000)

"This would create second object of Employee class"

emp2 = Employee("Manni", 5000)

emp1.displayEmployee()

emp2.displayEmployee()

print "Total Employee %d" % Employee.empCount

When the above code is executed, it produces the following result −

Name :  Zara ,Salary:  2000

Name :  Manni ,Salary:  5000

Total Employee 2

You can add, remove, or modify attributes of classes and objects at any time −

emp1.age = 7  # Add an 'age' attribute.

emp1.age = 8  # Modify 'age' attribute.

del emp1.age  # Delete 'age' attribute.

Instead of using the normal statements to access attributes, you can use the following functions −

The getattr(obj, name[, default]) − to access the attribute of object.

The hasattr(obj,name) − to check if an attribute exists or not.

The setattr(obj,name,value) − to set an attribute. If attribute does not exist, then it would be created.

The delattr(obj, name) − to delete an attribute.

hasattr(emp1, 'age')    # Returns true if 'age' attribute exists

getattr(emp1, 'age')    # Returns value of 'age' attribute

setattr(emp1, 'age', 8) # Set attribute 'age' at 8

delattr(empl, 'age')    # Delete attribute 'age'

Built-In Class Attributes

Every Python class keeps following built-in attributes and they can be accessed using dot operator like any other attribute −

__dict__ − Dictionary containing the class's namespace.

__doc__ − Class documentation string or none, if undefined.

__name__ − Class name.

__module__ − Module name in which the class is defined. This attribute is "__main__" in interactive mode.

__bases__ − A possibly empty tuple containing the base classes, in the order of their occurrence in the base class list.

For the above class let us try to access all these attributes

class Employee:

  'Common base class for all employees'

  empCount = 0

  def __init__(self, name, salary):

     self.name = name

     self.salary = salary

     Employee.empCount += 1

  def displayCount(self):

    print "Total Employee %d" % Employee.empCount

  def displayEmployee(self):

     print "Name : ", self.name,  ", Salary: ", self.salary

print "Employee.__doc__:", Employee.__doc__

print "Employee.__name__:", Employee.__name__

print "Employee.__module__:", Employee.__module__

print "Employee.__bases__:", Employee.__bases__

print "Employee.__dict__:", Employee.__dict__

When the above code is executed, it produces the following result −

Employee.__doc__: Common base class for all employees

Employee.__name__: Employee

Employee.__module__: __main__

Employee.__bases__: ()

Employee.__dict__: {'__module__': '__main__', 'displayCount':

<function displayCount at 0xb7c84994>, 'empCount': 2,

'displayEmployee': <function displayEmployee at 0xb7c8441c>,

'__doc__': 'Common base class for all employees',

'__init__': <function __init__ at 0xb7c846bc>}

uiy

explanation: