```python
import datetime
day = ((datetime.datetime.now())+datetime.timedelta(days= -7)).strftime("%Y%m%d")
当要获取前一天者(days= -1)，几天前就减几
```python
import datetime
day = ((datetime.datetime.now())+datetime.timedelta(days= -7)).strftime("%Y%m%d")
当要获取前一天者(days= -1)，几天前就减几
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