weight = 80.5height = 1.75bmii = '%.1f' % (weight /height /height)bmi = float(bmii)print(bmi)if bmi < 18.5:    print('体重过轻')elif bmi <= 25:    print('正常')elif bmi <= 28:    print('过重')elif bmi <= 32:    print('肥胖')else:    print('严重肥胖')