Descriptors

Objects that control attribute access on another class via __get__, __set__ and __delete__ — the machinery behind properties and methods.

Advanced

Comments 0

class Positive:
    def __set_name__(self, owner, name): self.name = "_" + name
    def __get__(self, obj, objtype=None): return getattr(obj, self.name)
    def __set__(self, obj, value):
        if value <= 0: raise ValueError(f"{self.name[1:]} must be > 0")
        setattr(obj, self.name, value)

class Capacitor:
    farads = Positive()

Spotted a mistake or want to add detail? Suggest an improvement — Content Contributors' edits are reviewed by editors before they go live.

Discussion (0)