how to add setter in pyhton code example

Example: setter in python

# of get() and set() method in 
# normal function 
  
class Geek: 
    def __init__(self, age = 0): 
         self._age = age 
      
    # getter method 
    def get_age(self): 
        return self._age 
      
    # setter method 
    def set_age(self, x): 
        self._age = x 
  
raj = Geek() 
  
# setting the age using setter 
raj.set_age(21) 
  
# retrieving age using getter 
print(raj.get_age())