爲什麼在Python中輸入這段代碼時會得到一個空白的Tkinter盒子？

Question

大部分代碼由我的教授提供，我必須對其格式進行更改。但是，當我運行該程序時，他的原始代碼甚至沒有在tk框中提供任何東西。我做了一些改變，但沒有什麼工作。任何建議？

這是我的主要代碼：

from Tkinter import * 
import todo 
master = Tk() 

class todoApp(): 

    def __init__(self, master): 
     self.master = master 
     self.frame = Frame(master) 
     self.frame.grid() 
     self.todo = todo.todoList() 

     self.saveButton = Button(self.frame, text="Save", command=self.save) 
     self.saveButton.grid() 
     self.restoreButton = Button(self.frame, text="Restore", command = self.restore) 
     self.restoreButton.grid(row=1, column=1) 
     self.addButton = Button(self.frame, text="Add", command=self.add) 
     self.addButton.grid(row=0,column=2) 
     self.doneButton = Button(self.frame, text="Done", command=self.done) 
     self.doneButton.grid(row=0,column=3) 
     self.button = Button(self.frame, text="Quit", command=self.quit) 
     self.button.grid(row=0, column=4) 

     label = Label(self.frame, text="New Task: ") 
     label.grid() 
     self.entry = Entry(self.frame) 
     self.entry.grid(row=1, column=1, columnspan=4) 

     frame1 = LabelFrame(self.frame, text="Tasks") 
     frame1.grid(columnspan=5, sticky=E+W) 
     frame1.columnconfigure(0,weight=1) 
     self.tasks = Listbox(frame1) 
     self.tasks.grid(sticky=E+W) 

     frame2 = LabelFrame(self.frame, text="Completed") 
     frame2.grid(columnspan=5, sticky=E+W) 
     frame2.columnconfigure(0,weight=1) 
     self.completed = Listbox(frame2) 
     self.completed.grid(sticky=E+W) 


    def save(self): 
     self.todo.saveList("tasks.txt") 

    def restore(self): 
     self.todo.restoreList("tasks.txt") 
     items = self.todo.getTasks() 
     self.tasks.delete(0,END) 
     for item in [ "study", "grocery shop", "cram for finals!", "sleep", "build a gingerbread house" ]: 
      self.tasks.insert(END,item) 
     items = self.todo.getCompleted() 
     self.completed.delete(0,END) 
     for item in items: 
      self.completed.insert(END,item) 

    def add(self): 
     task = self.entry.get() 
     self.todo.addTask(task) 
     self.tasks.insert(END,task) 

    def done(self): 
     selection = self.tasks.curselection() 
     if len(selection) == 0: 
      return 
     task = self.tasks.get(selection[0]) 
     self.todo.completeTask(task) 
     self.tasks.delete(selction[0]) 
     self.completed.insert(END,task) 

    def quit(self): 
     self.frame.quit() 
     self.master.destroy() 

master.mainloop() 

的todo進口是：

class todoList: 
    def __init__(self): 
     self.todo = [] 
     self.done = [] 

    def addTask(self,task): 
     self.todo.append(task) 

    def completeTask(self,task): 
     if self.todo.count(task) > 0: 
      self.todo.remove(task) 
      self.done.append(task) 

    def getTasks(self): 
     return self.todo 

    def getCompleted(self): 
     return self.done 

Answer 1

它就像你沒有創建類的實例，在我看來。

在你的文件的底部，補充一點：

myApp = todoApp(master) 
master.mainloop() 

這可能是因爲他們必須按相反的順序（我在工作，所以我不能嘗試它現在）。

Answer 2

您還沒有創建類todoApp的一個實例，

加入這一行的位置：

def quit(self): 
    self.frame.quit() 
    self.master.destroy() 

a = todoApp(master) 

master.mainloop() 

你確實需要更動定位不過，當我運行它，它看起來有點亂。

編輯：

這正是你在找什麼？

from Tkinter import * 
import todo 
master = Tk() 

class todoApp(): 

    def __init__(self, master): 
     self.master = master 
     self.frame = Frame(master) 
     self.frame.grid() 
     self.todo = todo.todoList() 

     self.buttonframe = LabelFrame(self.frame, text='controls') 
     self.buttonframe.grid(row=0, column=0, columnspan=2) 
     self.saveButton = Button(self.buttonframe, text="Save", command=self.save) 
     self.saveButton.grid() 
     self.restoreButton = Button(self.buttonframe, text="Restore", command = self.restore) 
     self.restoreButton.grid(row=0, column=1) 
     self.addButton = Button(self.buttonframe, text="Add", command=self.add) 
     self.addButton.grid(row=0,column=2) 
     self.doneButton = Button(self.buttonframe, text="Done", command=self.done) 
     self.doneButton.grid(row=0,column=3) 
     self.button = Button(self.buttonframe, text="Quit", command=self.quit) 
     self.button.grid(row=0, column=4) 

     label = Label(self.frame, text="New Task: ") 
     label.grid(row=1, column=0) 
     self.entry = Entry(self.frame) 
     self.entry.grid(row=1, column=1) 

     frame1 = LabelFrame(self.frame, text="Tasks") 
     frame1.grid(columnspan=5, sticky=E+W) 
     frame1.columnconfigure(0,weight=1) 
     self.tasks = Listbox(frame1) 
     self.tasks.grid(sticky=E+W) 

     frame2 = LabelFrame(self.frame, text="Completed") 
     frame2.grid(columnspan=5, sticky=E+W) 
     frame2.columnconfigure(0,weight=1) 
     self.completed = Listbox(frame2) 
     self.completed.grid(sticky=E+W) 


    def save(self): 
     self.todo.saveList("tasks.txt") 

    def restore(self): 
     self.todo.restoreList("tasks.txt") 
     items = self.todo.getTasks() 
     self.tasks.delete(0,END) 
     for item in [ "study", "grocery shop", "cram for finals!", "sleep", "build a gingerbread house" ]: 
      self.tasks.insert(END,item) 
     items = self.todo.getCompleted() 
     self.completed.delete(0,END) 
     for item in items: 
      self.completed.insert(END,item) 

    def add(self): 
     task = self.entry.get() 
     self.todo.addTask(task) 
     self.tasks.insert(END,task) 

    def done(self): 
     selection = self.tasks.curselection() 
     if len(selection) == 0: 
      return 
     task = self.tasks.get(selection[0]) 
     self.todo.completeTask(task) 
     self.tasks.delete(selection[0]) 
     self.completed.insert(END,task) 

    def quit(self): 
     self.frame.quit() 
     self.master.destroy() 

a = todoApp(master) 

master.mainloop()