我如何使我的蟒食品計算器保持一致？

while 1: 
    pie = 50 
    pieR = pie 
    pieRem = pieR - buy 
    print("We have ", pieRem, "pie(s) left!") 
    buy = int(input("How many pies would you like? ")) 
    pieCost = 5 
    Pie = pieCost * buy 
    if buy == 1: 
     print(pieCost) 
     pieS = pieR - buy 
    elif buy > 1: 
     print(Pie * 0.75) 
    else: 
     print("Please enter how many pies you would like!")

當我打開控制檯時，它詢問我想要購買多少個餡餅，而且我已經制作出了我們剩下的餡餅數量，但每次餡餅的價值都會刷新。所以如果我選擇了我第一次想要2個餅的話，那麼我們還剩下48個餅（默認餅值爲50），然後在第二次問我後，我輸入3，而不是下降到45，它刷新並下降到47.我如何使我的蟒食品計算器保持一致？

我希望我解釋得很好，希望有人知道如何解決這個問題，謝謝。

來源

2013-07-05 Samir Chahine

您的每一次代碼循環回到起點，pie被重新定義爲50.你要定義while循環的變量pie外：

pie = 50 
while 1: 
    ...

很抱歉，但你的代碼是一團糟，尤其是變量名稱。我清理了你：

buy = 0 
pies = 50 
cost = 5 
while 1: 
    print("We have ", pies, "pie(s) left!") 
    buy = int(input("How many pies would you like? ")) 
    price = cost * buy 
    if buy == 1: 
     print(price) 
     pies -= 1 
    elif buy > 1: 
     print(buy * 0.75) 
     pies -= buy 
    else: 
     print("Please enter how many pies you would like!")

來源

2013-07-05 03:16:32 TerryA

我試過了，但它仍然刷新 –

@SamirChahine我已經清理了你的代碼 – TerryA

檢查我的答案itworks。 @Haidro有一些錯誤，比如'pies-buy'等 – suhailvs

從@Haidros代碼下面

buy,pies,cost = 0,50,5 
while 1: 
    if pies<1: 
     print ('Sorry no pies left') 
     break 
    print("We have ", pies, "pie(s) left!") 
    buy = int(input("How many pies would you like? ")) 
    if pies-buy<0:buy = int(input("Only %s pies remaining How many pies would you like?"%pies))     
    if buy>0: 
     if buy==1:print(cost*buy) 
     else:print(cost*buy * 0.75) 
     pies-=buy  
    else: 
     print("Please enter how many pies you would like!")

來源

2013-07-05 03:32:53 suhailvs

這只是我的答案的副本，密集的代碼，看起來很糟糕：'稀疏比密集好。' – TerryA

@Haidro對不起，我會提及你的代碼中的名稱。抱歉！！ :-( – suhailvs

如果您使用的類和你同全局變量做以外的物體，你可以輕鬆地擴展代碼到其他產品（例如：牛角麪包，百吉餅，湯，咖啡，三明治或任何..）

class pies: 
""" Object To Sell Pies """ 

def __init__(self): 
    """ Constructor And Initialise Attributes """  
    self.pies=50 
    self.amount = 0  
    self.cost = 5 

def buy(self,buy): 
    """ Method To Buy Pies """  

    if (buy > self.pies): 
     print "Sorry Only %d Pies in Stock" % self.pies 
    elif (self.pies >= 1): 
     self.pies =self.pies - buy 
     print "Cost is : %.02f" % (0.75 * buy) 
     print "We have %d and pies in stock" % (self.pies) 
    elif (self.pies == 1): 
     self.pies =self.pies - buy 
     print "Cost is : %.02f" % (self.cost * buy) 
     print "We have %d pies in stock now" % (self.pies) 

    else: 
     print "Sorry Pies Out of Stock !" 
     self.buy = 0 
     self.pies = 0

除上文pieobject.py那麼代碼這個稱呼它：

#!/usr/bin/env python 

import os 
from pieobject import pies 

p = pies() 

while True: 

    try: 
     amount=int(raw_input('Enter number of pies to buy:')) 
    except ValueError: 
     print "Not a number"  
     break 

    os.system('clear') 
    p.buy(amount)

來源

2013-07-05 10:43:37

我如何使我的蟒食品計算器保持一致？

回答

相關問題