import pandas as pd
import datetime

def main():
    foo = pd.Timestamp.now()
    bar = datetime.date.today() + datetime.timedelta(days=-1)
    res = bar + datetime.timedelta(hours=24)
    print(res, type(res))

if __name__ == '__main__':
    main()

datetime.date + datetime.timedelta 结果仍然是 datetime.date 因而不能与时间进行比较