How to define a method in Python class?
Hello folks, today we are going to discuss defining a method in a Python class. Methods are basically normal functions inside a class.
Defining a method in Python class
- Define a class (ex: CodeSpeedy)
- Define a method inside the class using the ‘def ‘ keyword
- Now the methods can be called outside the class using objects
Defining a method
Defining a method consists of two parts:
- Method Declaration
- Declaring the name of the method and required parameters
- Method Body
- Consists the code to be implemented
Defining a method inside a class is similar to creating a Python function outside the class. Inside the class also, you have to use the def keyword to define a method. A function inside the class is known as the method.
Below is the syntax on how to create a method inside the class:
class ClassName: # Defining the method def metho_name(parameters): # Code block
Using the method from the class
To use a method from the class we need to perform following steps:
- Declare an object for the class
- Using the object we can implement the methods inside the class
Let us look into an example:
class CodeSpeedy: #Declaring the class def fibanocci(self,n): #Definig the method l = [0,1] # l is a list a = 0 b = 1 if n == 1: return  #Returns  as it is the only element which is part of fibanocci sequence less than 1 if n==2: return [0,1] ##Returns [0,1] as they are the only element which is part of fibanocci sequence less than 1 for i in range(3,n+1): if a+b >=n: break c = a+b l.append(c) a = b b = c return l k=150 object = CodeSpeedy() # Declaring an object for CodeSpeedy class print(object.fibanocci(k)) #Calling the method
[0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144]
We defined a Fibonacci method in the CodeSpeedy class, this method prints the numbers which are in the Fibonacci sequence less than a given number.
Defining methods using other methods from same class
Calling the method from the same class is done by using the “self” keyword. It is explained clearly in the following code.
class CodeSpeedy: def square(self,n):#Method for finding square return n*n def cube(self,n):#Method for finding cube return n*n*n def prints(self,n): #Method for printing square and cube print("Square of n is",self.square(n)) #Calling the first method from class print("Cube of n is",self.cube(n)) #Calling the second method from class return "Used methods from class" ob = CodeSpeedy() #Decalring an object print(ob.prints(3))#Calling the method
Square of n is 9 Cube of n is 27 Used methods from class
Don’t stop learning
Learn more about classes and methods here
Thanks for reading