為什么在 Python 中輸入此代碼時會得到一個空白的 Tkinter 框？

Question

大部分代碼是我的教授提供的，我必須對他的格式進行更改。 但是，當我運行程序時，他的原始代碼甚至沒有在 tk 框中提供任何內容。 我做了一些更改，但沒有任何效果。 有什么建議嗎？？

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()

todo導入是：

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

您還沒有創建類todoApp的實例，

在此處添加這一行：

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

a = todoApp(master)

master.mainloop()

不過你確實需要弄亂定位，當我運行它時，它看起來有點亂。

編輯：

這正是您要找的嗎？

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()

Answer 2

在我看來，您還沒有創建類的實例。

在文件底部，添加以下內容：

myApp = todoApp(master)
master.mainloop()

可能是它們必須按相反的順序排列（我正在工作，所以我現在無法嘗試）。