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
157
구조화된 데이터
객체
객체
객체
객체
키#1
키#2
키#3
키#4
딕셔너리
‘in’으로 멤버십 확인하기
fruits
딕셔너리에
banana
라는 행의 데이터를 추가하고 어떤 일이 일어나는지
확인합시다. 하지만 이번에는
apples
와 달리
bananas
를 바로 할당하지 않고
fruits
딕셔너리에
bananas
키가 있으면 관련 값을
1
증가시키고
bananas
키가
없으면
1
로 초기화합니다. 이는 딕셔너리를 이용해 빈도수를 계산할 때 많이 사용하는
기법이며, 이와 같은 방식을 사용하면
KeyError
문제를 방지할 수 있습니다.
>>> if 'bananas' in fruits:
fruits['bananas'] += 1
else:
fruits['bananas'] = 1
>>> fruits
{'bananas': 1, 'apples': 10}
‘
bananas
’
키가 딕셔너리에 있는지 확인합니다.
딕셔너리에 없으면 값을 1로 초기화합니다. 이런
방식으로
‘
KeyError
’
문제를 방지할 수 있습니다.
‘
bananas
’
값이 1로 설정됐어요!
apples
10
fruits
‘
bananas
’
코드를
실행하기 전
상태입니다.
다음 코드에서는 바나나 때문에 미끄러지지 않도록
if
문과
in
연산자를 조합해
작업을 깔끔하게 처리합니다.
아래 그림이 보여주는
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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.