- 670 名前：デフォルトの名無しさん [2020/10/04(日) 10:51:24.57 ID:WrglaOe5.net]
- import io
import datetime
import pandas as pd
csv = '''
日付,来客数
2020/9/9,15
2020/9/10,18
2020/9/11,12
2020/9/12,17
'''
df = pd.read_csv(io.StringIO(csv), header=0)
print(df)
wn = ['月', '火', '水', '木', '金', '土', '日']
f = lambda s: wn[datetime.datetime.strptime(s, '%Y/%m/%d').weekday()]
df = pd.concat([df, df.iloc[:, 0].apply(f).rename('曜日')], axis=1)
print(df)
