# -*- coding: utf-8 -*-

height = 1.75
weight = 80.5
bmi = weight/height/height
if bmi>32:
    print('严重肥胖')
elif bmi>28:
    print('肥胖')
elif bmi>25:
    print('过重')
elif bmi>18.5:
    print('正常')
else:
    print('过轻')

输出结果： 过重