Question

我有以下代码主要工作。我只需要它允许用户输入＆＃34;加载项＆＃34;直到他们输入sentinel值退出循环并让它添加选择。这是一个班级任务，但这是我遇到的所有困难。任何帮助将不胜感激。

    #start

def main():    #create a module - python function to hold main processing

    #declarations

    addinArray  = ["Whipped Cream", "Cinnamon", "Chocolate sauce", "Amaretto", "Irish whiskey"]
    priceArray = [0.89, 0.25, 0.59, 1.50, 1.75]  #this array holds the add-in prices

    loopFlag = ""  #sentinal value for looping
    cnt = 0
    COFFEECOST = 2  #constant to coffee cost

    addinName = ""
    totalCost = 0

    #input enter add-in name
    addinName = input("Enter on Keyboard Coffee Add-in (ex. Whipped Cream, Cinnamon, etc.) or Done to quit")
    while (addinName != "Done"):    #loop until addinName is Done
        while (cnt < len(addinArray)):
            if (addinName == addinArray[cnt]) :
                totalCost = priceArray[cnt] + totalCost
                print("Add-in ", addinName, " with a price of ", priceArray[cnt])
                print( "with a total add-in price so far of ", totalCost)
            cnt = cnt + 1  #increment counter for next element in array
        #end while

        addinName = input("Enter on Keyboard Coffee Add-in (ex. Whipped Cream, Cinnamon, etc.) or Done to quit")

    #end while
    totalCost = totalCost + COFFEECOST
    print("Total cost is: ", totalCost)
    main()
    #stop

Answer 1

我认为cnt = 0应该在第一个循环后重置：

while (addinName != "Done"):    #loop until addinName is Done
    cnt = 0

如果没有这个，在第一个附加cnt可以达到len(addinArray)并且永远不会在第二个while循环执行新附加组件之后。

Answer 2

我在本地运行你的代码，我发现了两件事。

您需要在嵌套cnt循环后将while变量重置为零，否则它将不会再次执行，因为条件cnd>5始终为true
input()调用似乎引发了错误，因此我测试了raw_input()并且似乎有效。

希望这有帮助！

添加单个项目价格的数组中的python循环

2 个答案: