如何将来自不同函数的两个局部变量相加？

Question

我试着写一个程序，计算出制作蛋糕需要多少特定的配料，然后把这些配料加在一起计算出每种配料总共需要多少。你知道吗

chocCupcake = int(input("How many chocolate cupcakes would you like to make? "))
lemonDrizzle = int(input("How many lemon drizzle cakes would you like to make? "))


def chocolate_cupcake():
    plainFlour = 12
    sugar = 14
    unsaltButter = 4
    freeRangeEgg = 0.1

    totalFlour = float(plainFlour * chocCupcake)
    totalSugar = float(sugar * chocCupcake)
    totalButter = float(unsaltButter * chocCupcake)
    totalEggs = float(freeRangeEgg * chocCupcake)

    print("""You will need:
"""+str(totalFlour)+""" grams of plain flour
"""+str(totalSugar)+""" grams of sugar
"""+str(totalButter)+""" grams of unsalted butter
"""+str(totalEggs)+" free range eggs ")

chocolate_cupcake()



def lemon_drizzle():
    plainFlour = 240
    sugar = 300
    unsaltButter = 80
    freeRangeEgg = 4.5

    totalFlour = float(plainFlour * lemonDrizzle)
    totalSugar = float(sugar * lemonDrizzle)
    totalButter = float(unsaltButter * lemonDrizzle)
    totalEggs = float(freeRangeEgg * lemonDrizzle)

    print("""You will need:
"""+str(totalFlour)+""" grams of plain flour
"""+str(totalSugar)+""" grams of sugar
"""+str(totalButter)+""" grams of unsalted butter
"""+str(totalEggs)+" free range eggs ")

lemon_drizzle()

所以我需要两种功能的面粉加在一起，还有总糖，等等。你知道吗

Answer 1

有很多不同的方法可以做到这一点，因为这主要是一个重构的问题。在我看来，最简单的方法是将这些成分作为每个功能的结果返回，如下所示：

def chocolate_cupcake():
    ...
    return [totalFlour, totalSugar, totalButter, totalEggs]

然后在调用每个函数时存储该信息

chocolate_ingredients = chocolate_cupcake()
lemon_drizzle_ingredients = lemon_drizzle()

然后你可以把它们加起来

print "Total Flour: " + (chocolate_ingredients[0] + lemon_drizzle_ingredients[0])
...etc

只是要补充一个警告，虽然这种方式需要改变现有的代码最少，但它绝对不是最好的方式。这不是最容易理解的。其中一个例子就是为什么recipe方法会以随机顺序返回配料列表。你知道吗