B3 - decorators

class Student:
    def __init__(self, name, house):
        if not name:
            raise ValueError("Invalid name")
        self.name = name
        self.house = house

    def __str__(self):
        return f"{self.name} from {self.house}"

    # getter for house
    @property
    def house(self):
        return self._house

    # setter for house
    @house.setter
    def house(self, house):
        if house not in ["Gryffindor", "Hufflepuff", "Ravenclaw", "Slytherin"]:
            raise ValueError("Invalid house")
        self._house = house

• decorators are properties used to 'harden' the code
• here @property defined _house as a property of the class, allowing how house should be set and retrieved - getter
• the leading underscore indicates that the value need not be modified directly
• the setter is called whenever the house property is set to validate the input