March 2022
Beginner to intermediate
796 pages
18h 14m
Korean
Content preview from 파이썬을 활용한 금융 분석(2판) : 파이썬의 기초부터 금융공학, 머신러닝, 퀀트 분석, 매매 시스템 구현까지
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315
9
장
입출력 작업
➎
하지만 동일한 데이터를 담고 있다.
➏
바이너리 저장 방식은
SQL
테이블에 비해 오버헤드가 적다.
9.2.3
CSV
파일 작업
데이터를 교환할 때 가장 널리 쓰이는 포맷 중 하나가
CSV
포맷이다. 표준화 포맷이라고 할 수
는 없지만
CSV
포맷은 데이터 분석이나 금융 분석을 하는 모든 플랫폼과 애플리케이션에서 처
리 가능하다.
9
.
1
.
2
절 텍스트 파일 읽고 쓰기에서 표준 파이썬 기능을 사용하여
CSV
파일로
데이터를 읽고 쓰는 법을 설명했다.
pandas
는 이 과정을 더 짧은 코드로 더 빠르고 편리하게
처리할 수 있다(그림
9
-
3
).
In [114]: %time data.to_csv(filename + '.csv')
➊
CPU times: user 6.44 s, sys: 139 ms, total: 6.58 s
Wall time: 6.71 s
In [115]: ll $path
total 283672
-rw-r--r-- 1 yves staff 43834157 Oct 19 12:11 numbers.csv
-rw-r--r-- 1 yves staff 52633600 Oct 19 12:11 numbers.db
-rw-r--r-- 1 yves staff 48007240 Oct 19 12:11 numbers.h5s
In [116]: %time ...
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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.