>>> from datetime import datetime, timedelta
>>> from dateutil.relativedelta import relativedelta
>>>
>>> d_str = '20200612'
>>> diff = 1
>>> d = str(datetime.date(datetime.strptime(d_str, '%Y%m%d')) - relativedelta(months=+diff)).replace("-", '')
>>> d
'20200512'
>>># 输入输出的时间格式根据需要的格式调整
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