單擊按鈕後，無法使用字符串更新標籤

試圖進入Python，我很確定答案就在我面前。但我不確定如何實現他人的想法。單擊按鈕後，無法使用字符串更新標籤

我有一本書籍清單，每本書都有一個清單，包含標題，期望清單和當前清單的兩種翻譯。我想要一個窗口彈出，然後點擊一個按鈕後，窗口將顯示書籍清單的摘要。（目前有4個）。

我可以把它打印出來，但沒有線索知道如何獲取GUI消息。另外，當我沒有在兩個地方定義invOutput時，我會得到錯誤...這看起來不正確。如果只是裏面的功能，它說，它是沒有定義的，如果它只有外面我得到UnboundLocalError: local variable 'invOutput' referenced before assignment

from Tkinter import * 

#These are all the books sorted in lists. 
books = [ #English Title, Spanish Title, Desired Stock, Current Stock 
["Bible", "Biblia", 10, 5], 
["Bible Teach", "Bible Teach", 10, 10], 
["Song Book", "El Song Book", 10, 10], 
["Daniel's Prophecy", "Spanish D Prof", 10, 10] 
] 

invOutput = "" 

def inventoryButton(): 
     invOutput = "" 
     for book in books: 
       if book[2] > book[3]: 
        invOutput += "Title: " + book[0] + "\n" 
        invOutput += "You need to order more books.\n\n" 
       else: 
        invOutput += "Title: " + book[0] + "\n" 
        invOutput += "Status: Inventory is sufficient.\n\n" 
     print invOutput 

############## 

window = Tk() 
window.title("Literature Inventory System") 
window.geometry("500x500") 

button = Button(window, text="Check Inventory", command=inventoryButton) 
button.pack() 

summary = Label(window, textvariable=invOutput) 
summary.pack() 

window.mainloop() 


##############

來源

2013-07-16 theamazingaustin

如果其他人的代碼讓你感到恐慌並且沒有幫助，那麼在這裏可能會有什麼好的答案？在學習編寫代碼之前，你必須學會閱讀代碼;這是沒有辦法的。 – abarnert

正如我理解你的問題，你想利用正在打印在終端和什麼在GUI中顯示它的權利？如果是這樣，這將做到這一點：

from Tkinter import * 


books = [ 
["Bible", "Biblia", 10, 5], 
["Bible Teach", "Bible Teach", 10, 10], 
["Song Book", "El Song Book", 10, 10], 
["Daniel's Prophecy", "Spanish D Prof", 10, 10] 
] 

def inventoryButton(): 
    invOutput = "" 
    for book in books: 
     if book[2] > book[3]: 
      invOutput += "Title: " + book[0] + "\n" 
      invOutput += "You need to order more books.\n\n" 
     else: 
      invOutput += "Title: " + book[0] + "\n" 
      invOutput += "Status: Inventory is sufficient.\n\n" 
    #Set the text of the Label "summary" 
    summary["text"] = invOutput 

window = Tk() 
window.title("Literature Inventory System") 
window.geometry("500x500") 

button = Button(window, text="Check Inventory", command=inventoryButton) 
button.pack() 

summary = Label(window) 
summary.pack() 

window.mainloop()

當您單擊「檢查庫存」，終端中打印的所有內容現在顯示在GUI中。

來源

2013-07-16 20:40:30 iCodez

非常感謝！ – theamazingaustin

這是令人尷尬的簡單。 – theamazingaustin

單擊按鈕後，無法使用字符串更新標籤

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