decorator_property.py

class Pokemon(object):

    def __init__(self, name, skill, level):
        self.name = name
        self.skill = skill
        self.level = level

    @property
    def attack_power(self):
        return self.level * 100

name = "Pikachu"
skill = "thunder"
level = 100

Pikachu = Pokemon(name, skill, level)
print(Pikachu.attack_power)