In [1]: import pandas as pd pd.set_option('display.max_columns',500) #생략없이 모두 출력 In [2]: marathon_2015 = pd.read_csv("C://Users//82106//Desktop//boston-results//marathon_results_2015.csv") marathon_2016 = pd.read_csv("C://Users//82106//Desktop//boston-results//marathon_results_2016.csv") marathon_2017 = pd.read_csv("C://Users//82106//Desktop//boston-results//marathon_results_2017.csv") b..