Question

希望有人可以提供帮助。我试图创建一个虚拟自动售货机。到目前为止我已经使用了我的代码，但仍坚持了一些事情。我需要帮助来创建本节中的代码。

count = 0
TotalCredit = 0
coinNum = int (input("How many coins would you like to enter: "))
while count in range (coinNum):
    coin = float (input ("Coins accepted 0.10 0.20 0.50 1.00: £ "))
    TotalCredit = TotalCredit + coin
count = count + 1

因此，如果输入的硬币不是0.10 0.20 0.50 1.00，则会打印一条消息＆＃34;输入的无效硬币请再试一次＆＃34; 并循环回来开始。

我还需要一个while循环，所以如果输入的信用不足，就会打印出来＆＃34;资金不足请加入更多信用＆＃34;并返回允许您添加信用。我知道最低信用额度是0.59，所以我知道循环是类似于＆＃39;而TotalCredit＆lt; 0.59但不知道如何发送用户回来添加更多。我已经列出了下面的代码，所以你可以看到我走了多远。我只有15岁，只是学习编码所以请尽可能多的帮助将非常感激。

def vendingMachine():

    count = 0
    TotalCredit = 0
    coinNum = int (input("How many coins would you like to enter: "))
    while count in range (coinNum):
        coin = float (input ("Coins accepted 0.10 0.20 0.50 1.00: £ "))
        TotalCredit = TotalCredit + coin
    count = count + 1

    print ("You have £",round(TotalCredit,2),"credit " )    
    print ("")
    print ("Choose your item:")
    print ("")       
    print ("1.Coco-Cola")
    print ("2.Walkers Cheese & Onion")
    print ("3.Lucozade")
    print ("4.Wosits")
    print ("5.Water")
    print ("")
    FinalCredit = TotalCredit
    round (FinalCredit, 2)

    item = int (input ("Enter the number for your item: "))
    print ("")
    while item <1 or item >5:
        print ("This item is not available.")
        item = int (input ("Enter the number for your item: "))
    if item == 1:
        FinalCredit = TotalCredit - 0.59
        print ("You now have a Coca-Cola can, costing £0.59.")
        print ("You have",round(FinalCredit,2),"credit remaning.") 
    elif item == 2:
        FinalCredit = TotalCredit - 0.69
        print ("You now have a Walkers crisp packet, costing £0.69.")
        print ("You have", round(FinalCredit,2),"credit remaning.")  
    elif item == 3:
        FinalCredit = TotalCredit - 0.99 
        print ("You now have a Lucozade drink, costing £0.99.")
        print ("You have" ,round(FinalCredit,2),"credit remaning.") 
    elif item == 4:
        FinalCredit = TotalCredit - 0.59
        print ("You now have a Wosits crisp packet, costing £0.59.")
        print ("You have",round(FinalCredit,2),"credit remaning.")   
    elif item == 5:
        FinalCredit = TotalCredit - 0.79
        print ("You now have a bottle of water, costing £0.79.")
        print ("You have",round(FinalCredit,2),"credit remaning.") 
    else:
        print ("This not an option.")
        print ("")
        print ("The rest of your money, £(0), has been        
    outputted.".format(round(FinalCredit,2)))       

vendingMachine ()

Answer 1

如何将代码的第二部分放在不同的方法中，然后根据用户输入调用vendingMachine()？此外，为了阻止余额低于0，我们可以在if / elif链中添加额外的条件语句。我们还需要添加TotalCredit参数（如下所述）。我添加了一些其他的编辑，我稍后会详细介绍。

def query(TotalCredit):
    print ("You have £" + str(round(TotalCredit,2)) + " credit\n")    
    print ("Choose your item:\n\n1.Coco-Cola\n2.Walkers Cheese & Onion\n3.Lucozade\n4.Wosits\n5.Water\n")
    FinalCredit = TotalCredit
    round (FinalCredit, 2)

    item = int (input ("Enter the number for your item: "))
    print ("")
    while item <1 or item >5:
        print ("This item is not available.")
        item = int (input ("Enter the number for your item: "))
    if item == 1 and FinalCredit >= 0.59:
        FinalCredit = TotalCredit - 0.59
        print ("You now have a Coca-Cola can, costing £0.59.")
    elif item == 2 and FinalCredit >= 0.69:
        FinalCredit = TotalCredit - 0.69
        print ("You now have a Walkers crisp packet, costing £0.69.") 
    elif item == 3 and FinalCredit >= 0.99:
        FinalCredit = TotalCredit - 0.99 
        print ("You now have a Lucozade drink, costing £0.99.") 
    elif item == 4 and FinalCredit >= 0.59:
        FinalCredit = TotalCredit - 0.59
        print ("You now have a Wosits crisp packet, costing £0.59.")
    elif item == 5 and FinalCredit >= 0.79:
        FinalCredit = TotalCredit - 0.79
        print ("You now have a bottle of water, costing £0.79.")
    else:
        print ("This not an option.\n")
        print ("The rest of your money, £(0), has been outputted.".format(round(FinalCredit,2)))
   print ("You have "+str(round(FinalCredit,2))+" credit remaning.") 
   again = input("Would you like to enter the vending machine (y/n)?")
   while again != 'y' and again != 'n':
       again = input("Please input y or n")
   if again == 'y':
       vendingMachine()

接下来，在vendingMachine()中，我们需要做的就是拨打query()并传递TotalCredit。

def vendingMachine():
    TotalCredit = 0
    count = 0
    coinNum = int (input("How many coins would you like to enter: "))
    while count in range (coinNum):
        coin = float (input ("Coins accepted 0.10 0.20 0.50 1.00: £ "))
        TotalCredit = TotalCredit + coin
        count = count + 1
    query(TotalCredit)

现在，程序将继续运行，直到用户在出现提示时输入“n”。这是完整的代码：

def query(TotalCredit):
    print ("You have £" + str(round(TotalCredit,2)) + " credit\n")     
    print ("Choose your item:\n\n1.Coco-Cola\n2.Walkers Cheese & Onion\n3.Lucozade\n4.Wosits\n5.Water\n")
    FinalCredit = TotalCredit
    round (FinalCredit, 2)

    item = int (input ("Enter the number for your item:\n"))
    while item <1 or item >5:
        print ("This item is not available.")
        item = int (input ("Enter the number for your item: "))
    if item == 1 and FinalCredit >= 0.59:
        FinalCredit = TotalCredit - 0.59
        print ("You now have a Coca-Cola can, costing £0.59.")
    elif item == 2 and FinalCredit >= 0.69:
        FinalCredit = TotalCredit - 0.69
        print ("You now have a Walkers crisp packet, costing £0.69.")
    elif item == 3 and FinalCredit >= 0.99:
        FinalCredit = TotalCredit - 0.99 
        print ("You now have a Lucozade drink, costing £0.99.")
    elif item == 4 and FinalCredit >= 0.59:
        FinalCredit = TotalCredit - 0.59
        print ("You now have a Wosits crisp packet, costing £0.59.")
    elif item == 5 and FinalCredit >= 0.79:
        FinalCredit = TotalCredit - 0.79
        print ("You now have a bottle of water, costing £0.79.")
    else:
        print ("This not an option.\n")
        print ("The rest of your money, £(0), has been outputted.".format(round(FinalCredit,2)))
    print ("You have " + str(round(FinalCredit,2)) + " credit remaning.") 
    again = input("Would you like to enter the vending machine (y/n)?\n")
    while again != 'y' and again != 'n':
       again = input("Please input y or n\n")
    if again == 'y':
       vendingMachine()


def vendingMachine():
    count = 0
    TotalCredit = 0
    coinNum = int (input("How many coins would you like to enter: "))
    while count in range (coinNum):
        coin = float (input ("Coins accepted 0.10 0.20 0.50 1.00: £ "))
        TotalCredit = TotalCredit + coin
        count = count + 1
    query(TotalCredit)

vendingMachine()

其他一些事情：

您可以将\n放在字符串中以添加新行，而不是使用emtpy print语句
str将字符串转换为字符串，字符串之间的+连接起来，或将它们组合在一起。
raw_input与input相同，除了它返回一个字符串（仅在Python 2.7中）
如果您发现自己不断重复相同的代码行，那么您需要将其放入函数中或为其找到更好的位置。例如，您在每个if / elif语句后使用print ("You have",round(FinalCredit,2),"credit remaning.")。相反，你可以在最后添加它（我做了）。

祝学习编程好运！如果您有任何其他问题，请告诉我。将来，请确保在发布之前正确格式化代码。我也会接受@wwii关于伪代码的建议并预先计划你要写的内容。

Python虚拟自动售货机

1 个答案: