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book
전문가를 위한 파이썬(2판)
by
루시아누 하말류
,
강권학
November 2024
Beginner to intermediate
1064 pages
25h 21m
Korean
Hanbit Media, Inc.
Content preview from
전문가를 위한 파이썬(2판)
985
23
장
속성 디스크립터
예제
23-7
bulkfood
_
v5
.
py
:
Quantity
와
NonBlank
디스크립터를 사용하는
LineItem
import model_v5 as model ❶
class LineItem:
description = model.NonBlank() ❷
weight = model.Quantity()
price = model.Quantity()
def __init__(self, description, weight, price):
self.description = description
self.weight = weight
self.price = price
def subtotal(self):
return self.weight * self.price
❶ 더 간결한 이름으로
model
_
v5
모듈을 임포트한다.
❷
model
.
NonBlank
()
를 사용한다. 나머지 코드는 바뀐 게 없다.
이 장에서 지금까지 보아온
LineItem
예제들은 데이터 속성을 관리하는 데 디스크립터를 사용
하는 전형적인 방법을 보여 준다.
Quantity(
)
같은 디스크립터는 오버라이딩 디스크립터라
고 부른다.
__set__(
)
메서드가 관리 대상 인스턴스에 있는 같은 이름의 인스턴스 속성의 설
정하는 것을 오버라이드
(
즉, 가로채고 뒤엎기
)
하기 때문이다. 그러나 ...
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Publisher Resources
ISBN: 9791169211772