Group by - SQL 의 Group by 명령어와 같이 그룹별로 집계하는 기능 from pandas import DataFrame,Series import pandas as pd import numpy as np pd_data = pd.read_csv("https://rfriend.tistory.com/attachment/cfile21.uf@99FC50395B825BD92D1949.txt", names = ['sex', 'length', 'diameter', 'height','whole_weight', 'shucked_weight', 'viscera_weight','shell_weight', 'rings']) #https://rfriend.tistory.com/attachment/cfile21.uf..
