Question

所以我基本上创建了我的函数（def main（），load（），calc（）和print（）。但我不知道如何允许用户输入他/她想要的信息，直到他们想要停止。就像我输入5次，它也会输出5次。我已经尝试将while循环放在def main（）函数和加载函数中，但是当我想要它时它不会停止。有人可以帮忙吗？谢谢！

def load():

    stock_name=input("Enter Stock Name:")
    num_share=int(input("Enter Number of shares:"))
    purchase=float(input("Enter Purchase Price:"))
    selling_price=float(input("Enter selling price:"))
    commission=float(input("Enter Commission:"))

    return stock_name,num_share,purchase,selling_price,commission

def calc(num_share, purchase, selling_price, commission):

    paid_stock = num_share * purchase
    commission_purchase = paid_stock * commission
    stock_sold = num_share * selling_price
    commission_sale = stock_sold * commission
    profit = (stock_sold - commission_sale) - ( paid_stock + commission_purchase)
    return paid_stock, commission_purchase, stock_sold, commission_sale, profit

def Print(stock_name,paid_stock, commission_purchase, stock_sold, commission_sale, profit):

    print("Stock Name:",stock_name)
    print("Amount paid for the stock:\t$",format(paid_stock,'10,.2f'))
    print("Commission paid on the purchase:$", format(commission_purchase,'10,.2f'))
    print("Amount the stock sold for:\t$", format(stock_sold,'10,.2f'))
    print("Commission paid on the sale:\t$", format(commission_sale,'10,.2f'))
    print("Profit(or loss if negative):\t$", format(profit,'10,.2f'))  

def main():

    stock_name,num_share,purchase,selling_price,commission = load()
    paid_stock,commission_purchase,stock_sold,commission_sale,profit = calc(num_share, purchase, selling_price, commission)
    Print(stock_name, paid_stock,commission_purchase, stock_sold, commission_sale, profit)

main()

Answer 1

您必须向用户提供某种方式来声明他们希望停止输入。代码的一种非常简单的方法是将main()函数的整个主体包含在while循环中：

response = "y"
while response == "y":
    stock_name,num_share,purchase,selling_price,commission = load()
    paid_stock,commission_purchase,stock_sold,commission_sale,profit = calc(num_share, purchase, selling_price, commission)
    Print(stock_name, paid_stock,commission_purchase, stock_sold, commission_sale, profit)
    response = input("Continue input? (y/n):")

Answer 2

更简单的方法是两个做以下......

while True:
    <do body>
    answer = input("press enter to quit ")
    if not answer: break

可替换地初始化变量并避免使用内部if语句

sentinel = True
while sentinel:
     <do body>
     sentinel = input("Press enter to quit")

如果输入被按下，则将sentinel设置为空str，将评估为False结束while循环。

循环函数（Python）

2 个答案: