Pandas練習問題(編集中) - Qiita

Deleted articles cannot be recovered. Draft of this article would be also deleted. Are you sure you want to delete this article? # -*- coding: utf-8 -*- import pandas as pd import numpy as np # ファイルパス定義 IN_FPATH = "./input/q1_input.csv" OUT_FPATH = "./output/q1_output.csv" # ファイルの読み込み df = pd.read_csv(IN_FPATH) df.date = pd.to_datetime(df.date) # q1-1) # 前回フェーズ列を追加せよ df_pre_phase = df.phase.copy()