我在哪里添加for循环?股票交易

Question

我是python的新手，我还在学习。我花了几个小时，但我想好了如何做功能，但我很难让用户输入他们想输入的数量。输出只工作一次，我确信这是因为for循环被分解为两个函数，但我似乎不知道for循环是否只进入加载，如果是，会影响def calc（）：？

  def main():
    num_stocks,name,numsh,pp,sp,comm=load()
    Amtpaid,bycomm,stocksold,scomm,profit=calc(num_stocks,name,numsh,pp,sp,comm)
    prnt(Amtpaid,bycomm,stocksold,scomm,profit)
def load():
    #load inputs
    num_stocks=int(input("How many stocks do you want processed?"))
    for i in range (num_stocks):
        print("Stock number",i+1)
        print(".....................")
        name=input("Enter stock name:n")
        numsh=float(input("Number of Shares:n"))
        pp=float(input("Enter Purchase Price:n"))
        sp=float(input("Enter Selling Price:n"))
        comm=float(input("Enter Commission:n"))
        print("Stock Results",end='')
        print("..................")
        return  num_stocks,name,numsh,pp,sp,comm
def calc(num_stocks,name,numsh,pp,sp,comm):
    #calculations
    for d in range (num_stocks):
        Amtpaid=numsh*pp
        bycomm=Amtpaid*comm
        stocksold=numsh*sp
        scomm=stocksold*comm
        profit=(Amtpaid+comm)-(scomm-comm)
        return Amtpaid,bycomm,stocksold,scomm,profit
def prnt(Amtpaid,bycomm,stocksold,scomm,profit):
    #print outputs
    print("Amount paid for stock:$",format(Amtpaid,',.2f'))
    print("Commision paid on the purchase:$",format(bycomm,',.2f'))
    print("Amount the stock sold for:$:",format(stocksold,',.2f'))
    print("Commission paid on the sale:$",format(scomm,',.2f'))
    print("Profit:$",format(profit,',.2f'))
    print("n")

main()

Answer 1

在for循环中：

for d in range(num_stucks):
       #todo
       prnt(a, b, c, d, e, f)

因为当你运行一次循环时，你会返回值，所以它会破坏循环。

Answer 2

问题在于您在load函数的for循环中应用的return语句。

把它带到圈外。若要调用其他函数，请在循环中调用它们。类似于在您的情况下调用call函数（您在main中调用该函数），而不是返回语句

def main():
    num_stocks,name,numsh,pp,sp,comm=load()

def load():
    #load inputs
    num_stocks=int(input("How many stocks do you want processed?"))
    for i in range (num_stocks):
        print("Stock number",i+1)
        print(".....................")
        name=input("Enter stock name:n")
        numsh=float(input("Number of Shares:n"))
        pp=float(input("Enter Purchase Price:n"))
        sp=float(input("Enter Selling Price:n"))
        comm=float(input("Enter Commission:n"))
        print("Stock Results",end='')
        print("..................")
        calc(num_stocks,name,numsh,pp,sp,comm)
def calc(num_stocks,name,numsh,pp,sp,comm):
    #calculations
    for d in range (num_stocks):
        Amtpaid=numsh*pp
        bycomm=Amtpaid*comm
        stocksold=numsh*sp
        scomm=stocksold*comm
        profit=(Amtpaid+comm)-(scomm-comm)
        prnt(Amtpaid,bycomm,stocksold,scomm,profit)
def prnt(Amtpaid,bycomm,stocksold,scomm,profit):
    #print outputs
    print("Amount paid for stock:$",format(Amtpaid,',.2f'))
    print("Commision paid on the purchase:$",format(bycomm,',.2f'))
    print("Amount the stock sold for:$:",format(stocksold,',.2f'))
    print("Commission paid on the sale:$",format(scomm,',.2f'))
    print("Profit:$",format(profit,',.2f'))
    print("n")

main()

这就是解决方案。

Answer 3

我在main()中只有一个for循环，它驱动对您为处理每个事务而定义的函数的一系列调用。祝贺你没有使用全局变量，这可能是我看到新手犯的第一个错误。

我还强烈建议您开始学习（并遵循）用于Python代码的PEP8风格指南，并使用更多的空格，这是您的朋友，因为它使您的代码可读性更强。

def main():
    num_stocks = int(input("How many stocks do you want processed?"))
    for stock_number in range(1, num_stocks+1):
        name, numsh, pp, sp, comm = load(stock_number)
        amtpaid, bycomm, stocksold, scomm, profit = calc(name, numsh, pp, sp,
                                                         comm)
        prnt(amtpaid, bycomm, stocksold, scomm, profit)
def load(stock_number):
    # load inputs for one transaction
    print("Stock number", stock_number)
    print(".....................")
    name = input("Enter stock name:n")
    numsh = float(input("Number of Shares:n"))
    pp = float(input("Enter Purchase Price:n"))
    sp = float(input("Enter Selling Price:n"))
    comm = float(input("Enter Commission:n"))
    print("Stock Results", end='')
    print("..................")
    return name, numsh, pp, sp, comm
def calc(name, numsh, pp, sp, comm):
    # calculations for one transaction
    amtpaid = numsh*pp
    bycomm = amtpaid*comm
    stocksold = numsh*sp
    scomm = stocksold*comm
    profit = (amtpaid+comm) - (scomm-comm)
    return amtpaid, bycomm, stocksold, scomm, profit
def prnt(amtpaid, bycomm, stocksold, scomm, profit):
    # print output for one transaction
    print("Amount paid for stock: ${:,.2f}".format(amtpaid))
    print("Commision paid on the purchase: ${:,.2f}".format(bycomm))
    print("Amount the stock sold for: ${:,.2f}".format(stocksold))
    print("Commission paid on the sale: ${:,.2f}".format(scomm))
    print("Profit: ${:,.2f}".format(profit))
    print("n")
main()