python 获取上个月时间

import datetime
import dateutil.relativedelta
now = datetime.datetime.now()
print(now)
date = now+ dateutil.relativedelta.relativedelta(months=-1) # 上个月时间
print(date)
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输出：
2022-08-05 02:04:51.660008
2022-07-05 02:04:51.660008