Def Keyword In Python

Overview:

  • def keyword in Python is used for defining a function. It is synonymous with the word definition.

  • In case of classes the def keyword is used for defining the methods of a class.

 

  • Note that the keyword self needs to be passed as the first parameter in member function definitions.

 

  • def keyword is also required to define special member function of a class like __init__().

 

 

Example 1:

In this example Python program a function is defined using the def keyword.

 

import math

 

def areaOfTheCircle(radius):

    return math.pi*radius*radius

 

radiusValue = 2

circleArea  = areaOfTheCircle(radiusValue)

print("Area of the circle with %f units radius is %f units"%(radiusValue, circleArea));

 

Output 1:

Area of the circle with 2.000000 units radius is 12.566371 units

 

Example 2:

In this example Python program a method of a class is defined using the def keyword.

import math

 

class Circle:

    myRadius = 0

   

    def __init__(self, radius):

        self.myRadius = radius

 

    def area(self):

        return math.pi*self.myRadius*self.myRadius

 

radius = 5

circle = Circle(radius)

print("Area of the circle with %f units radius is %f units"%(radius, circle.area()));

 

 

Output2:

Area of the circle with 5.000000 units radius is 78.539816 units

 


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