Getter Setter Deleter

Property Decorator

1. Getter

class Circle:
    def __init__(self, radius):
        self._radius = radius

    @property
    def radius(self):
        return self._radius

c = Circle(5)
print(c.radius)  # 5

2. Setter

class Circle:
    def __init__(self, radius):
        self._radius = radius

    @property
    def radius(self):
        return self._radius

    @radius.setter
    def radius(self, value):
        if value < 0:
            raise ValueError("Negative radius")
        self._radius = value

c = Circle(5)
c.radius = 10  # OK

3. Deleter

    @radius.deleter
    def radius(self):
        del self._radius

Summary

• @property for getter
• @prop.setter for setter
• @prop.deleter for deleter
• Clean interface