Constructor :
(i) Constructor is the special function that is created. In Python, there is a special function called "init", which act as a constructor.
(ii) It must begin and end with double underscore.
General format of Constructor :
General format of _init_ method (Constructor function)
def _init_(self, [args .... ]):
<statement>
Destructor :
(i) Destructor is also a special method to destory the objects.
(ii) In Python,_del_() method is used as destructor.It is just opposite to constructor.

Good Morning Bindu Madhavan.

In line No.8, del F.display will not come.

Code:
class Sample:
def_init_(self, n1, n2):
            self._n1=nt
            self_n2-n2
def sum(self):
           print ("Class Variable 1:" self_n1)
           print ("Class Variable 2:", self_n2)
S=Sample (5,10)
S.sum()
Output:
Class Variable 1:5
Class Variable 2: 10
Sum: 15

Variables defined inside a class are called as "Class Variable" and functions are called as "Methods. Class variable and methods are together known as members of the class. The class members should be accessed through objects or instance of class. A class can be defined anywhere in a Python program.
Defining classes: In Python, a class is defined by using the keyword class. Every class has a unique name followed by a colon (:).
Syntax for Defining a Class:
class class_name:
statement_1
statement_2
....................
....................
statement_n