input: Write a python function to create a class called 'Person' that contains a name, age, and a method get_age().
  assert Person('John', 30).get_age() == 30
  assert Person('Alice', 25).get_age() == 25
  assert Person('Bob', 40).get_age() == 40
output: class Person:
      def __init__(self, name, age):
          self.name = name
          self.age = age
  
      def get_age(self):
          return self.age