전체 글

    Data Science/Linux

    리눅스 디렉토리 구조

    Linux Directory Structure Most Linux-like OS uses FHF(Filesystem Hierarchy Standard) structure. This means files are categorized and stored into different folders under ROOT(/) directory, based on their types, usage and purpose. In usual cases those directories are: /bin, /sbin, /etc, /boot, /mnt, /usr, /lib, /home, /dev, /proc, /var, /tmp, /opt, /media 1. / Root Directory는 리눅스 시스템에서 최상위 디렉토리이다...

    Data Science/Database

    Transaction Management

    What does it mean by ACID properties in database transaction? Atomicity: All database operations of a transaction must be entirely completed or entirely aborted. Consistency: It must take the database from one consistent state to another. i.e. If DB goes down during the transaction, it should revert back to the original starting state. Isolation: Data used during execution cannot be used by the ..

    Data Science/Python

    Python으로 코스피 지수 불러오기

    우선 pandas-datareader를 설치해야한다. 설치방법은 Windows 검색 - cmd - 관리자 권한으로 실행 - 아래 명령어 입력 pip install pandas-datareader - Pandas Datareader library를 이용, 야후에서 2007년 1월1일부터 2017년 10월31일까지 KOSPI index를 불러옴 - 종가의 Median과, descriptive statistics, correlation을 구하고 line차트를 그렸음 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 import pandas_datareader as wb import pandas as pd import datetime import m..