使用字典，練習代碼

Question

我對以前的問題表示歉意，因爲它們含糊不清，難以回答。我對編程還是比較陌生的，現在仍然在學習它的全部內容。所以請耐心等待。現在到背景資料。我正在使用python 3.3.0。我已經將它加載到Eclipse IDE上，這就是我正在使用的代碼編寫和測試。

現在，我正在嘗試學習如何創建和使用字典。因此，我的任務是創建一個價格匹配代碼，通過用戶界面不僅可以搜索字典中的項目（這是鍵和與位置和價格相關的值）。到目前爲止我創建了一個運行良好的用戶界面，但沒有任何錯誤（至少在IDE中）當我運行並輸入所有提示時，空字典不會更新，因此我不能再撥打電話詞典爲早期輸入。

我有我在下面寫的代碼，並希望如果有人能告訴我，如果我正確地做事。如果有更好的方法去解決這個問題。我仍然在學習，所以圍繞代碼術語的更詳細的解釋會很有用。

print("let's Price match") 
decition = input("Are you adding to the price match list?") 
if decition == "yes": 
    pricematchlist = {"Snapple":["Tops",99]} 
    location = input("Now tell me where you shopped") 
    item = input("Now what was the item") 
    price = input("Now how much was the item") 
    int(price) 
    pricematchlist[item]=location,price 
    print(pricematchlist) 
else: 
    pricematchlist = {"Snapple":["Tops",99]} 
    reply = input("Ok so you want to search up a previous price?") 
    if reply == "yes": 
     search = input("What was the item?") 
     pricematchlist.item(search) 

Answer 1

這些是一些小的變化。對於字典：您正確使用它們。

print("let's Price match") 
pricemathlist = {"Snapple":["Tops", 99]} # assign it here 
decition = input("Are you adding to the price match list?").lower() #"Yes"-->"yes" 
if decition == "yes": 
    # pricematchlist = {"Snapple":["Tops",99]} 
    # If this whole code block is called repeatedly, you don't want to reassign it 
    location = input("Now tell me where you shopped") 
    item = input("Now what was the item") 
    price = int(input("Now how much was the item")) 
    # int(price) does nothing with reassigning price 
    pricematchlist[item]=location,price 
    print(pricematchlist) 
else:  
    reply = input("Ok so you want to search up a previous price?").lower() 
    if reply == "yes": 
     search = input("What was the item?") 
     print pricematchlist[search] # easier way of accessing a value