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Accessing attributes of an instance Accessing classes written in a separate file Calling a Parent Class method from Child Class Having classes that refer to other classes Modifying an attribute value Overriding methods from Parent Class Setting a default attribute value

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Modifying an attribute value in Python

Programming

Python

Classes

Cookbooks

Mar 10, 2022

Last updated

local_offer Python

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Directly Through a method

There are two main ways to modify an attribute's value: directly or through a method.


        
        
            
                
                
                    class Cat(): 
   # This is constructor for python
   def __init__(self, name, age): 
      self.name = name
      self.age = age 
   
   # Teaching each cat how to meow
   def meow(self):
      print("I am a " + str(self.age) + " year old " + self.name)

# Creating an instance my_cat representing my cat Roxas
my_cat = Cat("Roxas", 26)

Directly

To update name attribute value of my_cat:


        
        
            
                
                
                    my_cat = Cat("Roxas", 26)
my_cat.name = "Sora"
print(my_cat.name)
                
            
            Sora

Through a method

We can add a method update_age to the class definition to increment age by 1:


        
        
            
                
                
                    class Cat(): 
   # This is constructor for python
   def __init__(self, name, age): 
      self.name = name
      self.age = age 

   # Adding method to update age
   def update_age(self):
      self.age = self.age + 1

   # Teaching each cat how to meow
   def meow(self):
      print("I am a " + str(self.age) + " year old " + self.name)

To create an instance of Cat class and call update_age method:


        
        
            
                
                
                    my_cat = Cat("Roxas", 26)
my_cat.update_age()
print(my_cat.age)
                
            
            27

We can see that age has now been incremented by 1.

Published by Arthur Yanagisawa

Edited by 0 others

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