Python-计算身体质量指标BMI

摘要：今天学习了python中常用的几个循环语句，判断条件的使用，并且完成了简单demo来加深对这些知识的巩固。

一、问题：天天向上

A:一年365天，每天进步1%  B:工作5天休息2天，休息日下降1% 问：B的日工作量达到多少，才能和A一样。

def dayUP(df):#根据df参数计算日工作量的函数
    dayup = 1
    for i in range(365):
        if i % 7 in [6, 0]:
            dayup = dayup * (1 - 0.01)
        else:
            dayup = dayup * (1 + df)
    return dayup


def total():#每天进步1%
    dayup = 1
    dayfactor = 0.01
    dayup = pow(dayup+dayfactor, 365)
    return dayup


dayfactor = 0.01
while dayUP(dayfactor) < total(): #判断条件
    dayfactor += 0.001
print("工作日的努力参数是：{:.3f} ".format(dayfactor))

二、问题：计算身体质量指标BMI

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))