import datetime
dt = datetime.datetime.today()
totaldays = 10
lst = [dt - datetime.timedelta(days=x) for x in range(totaldays)]
for dt in lst:
print(dt)
'''
run:
2020-06-10 15:06:14.864655
2020-06-09 15:06:14.864655
2020-06-08 15:06:14.864655
2020-06-07 15:06:14.864655
2020-06-06 15:06:14.864655
2020-06-05 15:06:14.864655
2020-06-04 15:06:14.864655
2020-06-03 15:06:14.864655
2020-06-02 15:06:14.864655
2020-06-01 15:06:14.864655
'''