[Python] property - 클래스 문법 이용

데코레이터가 아닌 property class를 이용한 getter 와 setter 구현 방법에 대해서 알아보자

python shell에서 property 에 대한 help를 보면.

>>> help(property) >>> Help on class property in module builtins: class property(object) | property(fget=None, fset=None, fdel=None, doc=None) -> property attribute | | fget is a function to be used for getting an attribute value, and likewise | fset is a function for setting, and fdel a function for del'ing, an | attribute. Typical use is to define a managed attribute x: | | class C(object): | def getx(self): return self._x | def setx(self, value): self._x = value | def delx(self): del self._x | x = property(getx, setx, delx, "I'm the 'x' property.") | | Decorators make defining new properties or modifying existing ones easy: | | class C(object): | @property | def x(self): | "I am the 'x' property." | return self._x | @x.setter | def x(self, value): | self._x = value | @x.deleter | def x(self): | del self._x | | Methods defined here: | | __delete__(self, instance, /) | Delete an attribute of instance. | | __get__(self, instance, owner, /) | Return an attribute of instance, which is of type owner. | | __getattribute__(self, name, /) | Return getattr(self, name). | | __init__(self, /, *args, **kwargs) | Initialize self. See help(type(self)) for accurate signature. | | __new__(*args, **kwargs) from builtins.type | Create and return a new object. See help(type) for accurate signature. | | __set__(self, instance, value, /) | Set an attribute of instance to value. | | deleter(...) | Descriptor to change the deleter on a property. | | getter(...) | Descriptor to change the getter on a property. | | setter(...) | Descriptor to change the setter on a property. | | ---------------------------------------------------------------------- | Data descriptors defined here: | | __isabstractmethod__ | | fdel | | fget | | fset

''' Created on 2016. 10. 12. @author: icore ''' class Car: def __init__(self): self._price = 0 self._speed = 0 self._color = None def get_price(self): return self._price def set_price(self, value): self._price = value price = property (get_price, set_price) def get_speed(self): return self._speed def set_speed(self, value): self._speed = value speed = property (get_speed, set_speed) def get_color(self): return self._color def set_color(self, value): self._color = value color = property (get_color, set_color) if __name__ == '__main__': my_car = Car() my_car.price = 2000 my_car.speed = 20 my_car.color = 'red' print("price:", my_car.price) print("speed:", my_car.speed) print("color:", my_car.color)