（python）BMI计算

height,weight = eval(input("请输入身高（m）和体重（kg）[用逗号隔开]："))
bmi = weight/pow(height,2)
print("BMI指数为:{:.2f}".format(bmi))
who,nat = "",""
if bmi < 18.5:
    who,nat = '偏瘦','偏瘦'
elif bmi < 24:
    who,nat = '正常','正常'
elif bmi < 25:
    who,nat = '正常','偏胖'
elif bmi < 28:
    who,nat = '偏胖','偏胖'
elif bmi < 30:
    who,nat = '偏胖','肥胖'
else:
    who,nat = '肥胖','肥胖'
print("BMI指数为:国际'{}'，国内'{}'".format(who,nat))