December 2017
Beginner
624 pages
15h 38m
Korean
Content preview from Head First Python, 개정판 : 스스로 질문하며 답을 찾는 파이썬 학습서(Python 3)
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지금 여기예요
4
159
구조화된 데이터
객체
객체
객체
객체
키#1
키#2
키#3
키#4
딕셔너리
‘in’을 ‘not in’으로 바꾸기
이전 페이지 마지막 부분에서 대부분의 파이썬 프로그래머가
in
대신
not
in
을 이용해 네
행의 코드를 간결하게 줄인다고 설명했습니다. 이 기법을 적용한 예제를 통해
pears
키의
값을 증가시키기 전에
0
으로 초기화되는지 확인합시다.
>>> if 'pears' not in fruits:
fruits['pears'] = 0
>>> fruits['pears'] += 1
>>> fruits
{'bananas': 2, 'pears': 1, 'apples': 10}
필요하면 초기화함
증가
apples
10
fruits
‘
pears
’
코드의
두 행을 실행한 후
bananas
2
pears
1
세 행의 코드로 딕셔너리를 한 번 더 증가시켰습니다. 이제
fruits
딕셔너리는 세 개의
키/값 쌍을 포함합니다.
위 세 행의 코드는 아주 자주 사용되는 코드이므로 파이썬은
if
/
not
in
조합을 좀 더
간편하고 에러 걱정 없이 이용할 수 있도록 딕셔너리 메서드를 제공합니다.
setdefault
메서드는 한 행의 코드로 두 행의
if
/
not
in
명령문이 수행하는 작업을 합니다.
다음은
setdefault
를 이용해 위
pears
코드를 다시 작성한 것입니다. ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.