While循环函数（Python）

所以我基本上创建了我的函数（def main（）、load（）、calc（）和print（）。 但是我不知道如何允许用户在用户想要停止之前，按自己的要求输入信息多少次，就像我输入5次一样，它也会输出5次。我试着将while循环放在def main（）函数和load函数中，但当我想停止时它不会停止。有人能帮到吗？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()

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您必须为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式是将

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):")

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一个更简单的方法是两个人做以下事情

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

为True时：
回答=输入（“按回车键退出”）
如果没有，回答：中断

或者 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")

sentinel=True
而哨兵：
sentinel=输入（“按enter键退出”）

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如果按enter键，sentinel将设置为空str，这将计算为False，从而结束while循环。

尽管函数中的首字母大写方式有所不同

Print（）

（func名称中的大写字母与PEP 8相反），但像这样镜像内置内容仍然是一个非常糟糕的选择。我强烈建议更改名称。