Different ways to access Instance Variable in Python

#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)

# 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')