[Python] 12. pandas DataFrame 연산 : loc(),iloc(),boolean indexing, isin(), query(), f-string formatting 예제
import pandas as pd import numpy as np data = {'eng':[10,30,50,70], 'kor':[20,40,60,80], 'math':[90,50,20,70]} df = pd.DataFrame(data, index=['a','b','c','d'] ) df 산술 연산 df+1 df*2 df['eng'] = [1,2,3,4] df df['eng'] = df['eng'] + 2 df df.loc['a'] = df.loc['a'] + 2 df df.loc['b':'c','kor':] = [[1,2],[3,4]] df df.loc['b':'c','kor':] = df.loc['b':'c','kor':] +2 df boolean indexing data = {'eng':[1..
