Different ways to access Instance Variable in Python

Instance attributes are those attributes that are not shared by objects. Every object has its own copy of the instance attribute i.e. for every object, instance attribute is different.

There are two ways to access the instance variable of class:

Within the class by using self and object reference.
Using getattr() method

Example 1: Using Self and object reference

#creating class 
class student: 
      
    # constructor 
    def __init__(self, name, rollno): 
          
        # instance variable 
        self.name = name 
        self.rollno = rollno 
       
    def display(self): 
          
        # using self to access  
        # variable inside class 
        print("hello my name is:", self.name) 
        print("my roll number is:", self.rollno) 
          
# Driver Code 
# object created 
s = student('HARRY', 1001) 
  
# function call through object 
s.display() 
  
# accessing variable from  
# outside the class 
print(s.name) 

Output:

hello my name is: HARRY
my roll number is: 1001
HARRY

Example 2: Using getattr()

# Python code for accessing attributes of class  
class emp:  
    name='Harsh'
    salary='25000'
    def show(self):  
        print(self.name) 
        print(self.salary) 
          
# Driver Code 
e1 = emp()  
# Use getattr instead of e1.name  
print(getattr(e1,'name')) 
    
# returns true if object has attribute  
print(hasattr(e1,'name')) 
    
# sets an  attribute   
setattr(e1,'height',152)  
    
# returns the value of attribute name height  
print(getattr(e1,'height')) 
    
# delete the attribute  
delattr(emp,'salary')  

Output:

Harsh
True
152

My Personal Notes

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