pandasのdataframeで和暦を西暦に変換する - Qiita

import pandas as pd from datetime import datetime def read_wareki_csv(csv_filename): df = pd.read_csv(csv_filename, header=None, names=['date', 'memo'], skiprows=1, parse_dates=[0], date_parser=wareki_parser) return df def wareki_parser(date): wareki = { "R":2018, "H":1988 } date = str(int(date[1:3])+wareki[date[0]])+date[3:9] dt = datetime.strptime(date, '%Y.%m.%d') return dt if __name__ == '__ma