python--BMI

#bmi
height,weight = eval(input("请输入身高（m） 体重（kg）,以逗号隔开\n"))
bmi = weight/pow(weight,2)
print("BMI数值为:{:.2f}".format(bmi))
who,nat = "",""                     #who世界标准，nat国内标准
if bmi < 18.5 :
    who,nat = "偏瘦","偏瘦" 
elif 18.5<=bmi<24:
    who,nat = "正常","正常" 
elif 24<=bmi<25:
    who,nat = "正常","偏胖" 
elif 25<=bmi<28:
    who,nat = "偏胖","偏胖" 
elif 28<=bmi<30:
    who,nat = "偏胖","肥胖" 
else:
    who,nat = "肥胖","肥胖" 
print("BMI指标为：国际'{0}',国内'{1}'".format(who,nat))