python分支结构实例------身体质量指数BMI

学习体会：学会多个数据输入多个数据同时赋值的另一种方法

#接收多个输入的方法， 中间用逗号隔开
height, weight = eval(input("请输入身高（米）和体重（公斤）[逗号隔开]："))
bmi = weight / pow(height, 2)
print("BMI 数值为：{:.2f}".format(bmi))
who, nat = "", ""
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))