Python 如何在if语句中选择函数

我需要帮助，允许用户选择一个值并相应地调用函数

weight = input('Enter K for kilos  or P for pounds : ')

unit = weight

if unit == "K":

    def metricTopound(kilograms):

        pounds = kilograms * 2.2
        ounces = pounds * 16

        return int(pounds), ounces % 16

        kilograms = float(input("How many Kilos ? "))
        lb, o = metricTopound(kilograms)
        print('The amount of pounds you entered is {}. '\
        'This is {} pounds and {} ounces.'.format(kilograms, lb, o))

elif unit == " P ":

    def poundsToMetric(pounds):
        kilograms = pounds / 2.2
        grams = kilograms * 1000

        return int(kilograms), grams % 1000

        pounds = float(input("How many Pounds? "))
        kg, g = poundsToMetric(pounds)
        print('The amount of pounds you entered is {}. '\
        'This is {} kilograms and {} grams.'.format(pounds, kg, g))

---

用户应该能够选择

p

以获得千克的重量，或者选择

K

以获得磅的重量。

您可能需要事先定义功能：

def metricTopound(kilograms):
    pounds = kilograms * 2.2
    ounces = pounds * 16

    return int(pounds), ounces % 16

def poundsToMetric(pounds):
    kilograms = pounds / 2.2
    grams = kilograms * 1000

    return int(kilograms), grams % 1000

weight = input('Enter K for kilos  or P for pounds : ')

unit = weight

if unit == "K":
    kilograms = float(input("How many Kilos ? "))
    lb, o = metricTopound(kilograms)
    print('The amount of kilograms you entered is {}. '\
    'This is {} pounds and {} ounces.'.format(kilograms, lb, o))
elif unit == "P":
    pounds = float(input("How many Pounds? "))
    kg, g = poundsToMetric(pounds)
    print('The amount of pounds you entered is {}. '\
    'This is {} kilograms and {} grams.'.format(pounds, kg, g))

输入的类型不正确，应在上面或单独的文件中定义，然后调用函数

return

语句下面的行永远不会执行

您正在将

“P”

传递给比较，因此用户需要先添加空格，然后添加P和尾随空格

固定代码

def metricTopound(kilograms):

        pounds = kilograms * 2.2
        ounces = pounds * 16

        return int(pounds), ounces % 16


def poundsToMetric(pounds):
        kilograms = pounds / 2.2
        grams = kilograms * 1000

        return int(kilograms), grams % 1000


unit = raw_input('Enter K for kilos  or P for pounds : ') #get as string

weight= input("Ener Weight") #get as integer

if unit == "K":
       metricTopound(weight)
       kilograms = float(input("How many Kilos ? "))
       lb, o = metricTopound(kilograms)
       print('The amount of pounds you entered is {}. '\
       'This is {} pounds and {} ounces.'.format(kilograms, lb, o))



elif unit == "P":
         poundsToMetric(weight)
         pounds = float(input("How many Pounds? "))
         kg, g = poundsToMetric(pounds)
         print('The amount of pounds you entered is {}. '\
         'This is {} kilograms and {} grams.'.format(pounds, kg, g))

---

为什么要在

if-else

块中定义函数？在外部定义它们，并在满足条件时调用它们。为什么在函数执行完成之前，您的函数会返回（）？谢谢，我非常感谢您的帮助。脚本现在正在运行