0%
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| from calendar import monthrange import pandas as pd
year = 2021 month = 1 mr = monthrange(year, month)[1] print(mr)
data = pd.Series(['2019-08-20', '2020-06-21', '2021-04-25', '2020-03-15']) df = pd.DataFrame(data, columns = ['date'])
df['date'] = pd.to_datetime(df['date'], format='%Y-%m-%d')
df['mr'] = df['date'].apply(lambda x: monthrange(x.year, x.month)[1]) print(df['mr'])
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