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
519
고급 반복
CSV 데이터를 리스트로 읽기
CSV
데이터 형식 자체는 그리 유용하지 않습니다. 하지만
CVS
파일을 읽어서 콤마를
행으로 바꿀 수 있다면 유용한 데이터를 얻을 수 있습니다.
문자열 객체의
split
메서드 등으로 직접 파이썬 코드를 구현해
‘
콤마를 행으로
’
바꿀 수도
있지만
CSV
데이터 작업은 흔한 일이므로 파이썬 표준 라이브러리에서
csv
라는 모듈을
제공합니다.
다음은
csv
모듈을 사용하는
for
루프 예제입니다.
read
를 이용해
CVS
파일의 전체
내용을 한 번에 읽었던 이전 예제와 달리 다음 코드에서는
csv
.
reader
로
CVS
파일을
for
루프에서 한 번에 한 행씩 읽습니다.
for
루프를 반복할 때마다
CSV
한 행의
데이터를
line
이라는 변수에 할당한 다음 화면에 출력합니다.
CSV 파일의 각 행이
리스트로 바뀌었네요.
더 좋아 보입니다.
‘
with
’
를 사용해서
파일을 열어요...
...그리고
‘
csv.reader
’
를
이용해 한 번에
한 행씩 읽어요.
여기서
csv
모듈은 많은 일을 합니다. 파일에서 가공되지 않은 각 행의 데이터를 읽어서 두
항목을 포함하는 리스트로
‘
마술같이
’
변환하죠.
파일의 첫 번째 행에 위치한 헤더 정보뿐 아니라 각각의 비행시간과 목적지 쌍도 리스트로
반환되었습니다. 각 ...
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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.