源码：

height = input('请输入您的身高（m）:')
weight = input('清输入您的体重（kg）:')
height = float(height)
weight = float(weight)
bmi = weight / (height*height)
if bmi < 18.5:
    print('体重过轻')
elif 18.5 <= bmi <= 23.9:
    print('标准身材')
elif 24 <= bmi <= 27:
    print('过重')
elif 28 <= bmi <= 32:
    print('大胖子')
else:
    print('超级大胖子')

直接打开输入完之后直接结束了

python：3.7