传递值在Python中输入value_sides

Question

为什么value_sides没有任何价值？我打算在entry_side中写入数字并将值传递给value_sides。

不要介意小部件的顺序，也会删除一些代码，以免混淆视图。

class WindowFunctions:
    def __init__(self, root):
       self.root = root
       self.dice = Die()
       self.data = Entry(root)

    def taking(self):
       value_sides = WindowFunctions(self.root).entry_side.get() # Here is the problem 
       value_throw = 1000
       value_dies = 2

       self.dice.generate_sides (value_sides)
       result = self.dice.generate_results (value_throw, value_dies)
       frequencies = self.dice.generate_frequencies (result)

    def window(self):

    # ----Entry--------------------------

       entry_side = Entry (self.root)
       entry_side.pack()

       entry_throw = Entry (self.root)
       entry_throw.pack()

       entry_dice = Entry (self.root)
       entry_dice.pack()

    # ---Button-----------------------------------------

       button_generate = Button(self.root, text='Generate', command=WindowFunctions(self.root).taking)
       button_generate.pack()

编辑：这是带根

的文件

root = Tk()
root.bind('<Escape>', quit)
die_function = WindowFunctions(root)
die_function.window()


root.mainloop()