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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318
3
부
금융 데이터 과학
9.3
PyTables
를 이용한 입출력
PyTables
는
HDF5
데이터베이스 파일 표준(
http
://
www
.
hdfgroup
.
org
)의 파이썬 바인딩
이다.
HDF5
는 입출력 연산의 성능을 최적화하고 가용 하드웨어를 최대한 이용할 수 있도록
설계되어 있다. 이 라이브러리의 임포트 이름은
tables
다.
pandas
와 마찬가지로
PyTables
도
인메모리 분석 시
SQL
데이터베이스를 완전히 대체할 수는 없어도 그 간격을 메울 수 있는 몇
가지 기능이 있다. 예를 들어
PyTables
데이터베이스는 여러 개의 테이블을 가지고 있으며 압
축, 인덱싱 그리고 대부분의 쿼리문을 지원한다. 또한
NumPy
배열을 효율적으로 저장할 수 있
으며 배열과 유사한 나름의 자료구조를 가지고 있다.
그럼 임포트부터 시작하자.
In [123]: import tables as tb
➊
import datetime as dt
➊
패키지 이름은
PyTables
지만 임포트 이름은
tables
다.
9.3.1
테이블 작업
PyTables
는
SQLite3
처럼 파일 기반의 데이터베이스 포맷을 제공한다.
5
다음 코드는 데이터
베이스 파일을 열어 테이블을 생성한다.
In [124]: filename = path + 'pytab.h5'
In [125]: h5 = tb.open_file(filename, ...
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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.