爲什麼我們在創建Toplevel窗口時通過根窗口的'窗口'屬​​性？

Question

我正在學習如何使用Okin方法使用tkinter創建父窗口和子窗口，但是在創建Toplevel窗口時不完全理解傳遞父窗口的「窗口」屬性的原因。見下文......

from tkinter import * 

class Main(): 

    def __init__(self, master): 
     self.master = master 
     self.master.title("Main Window") 

     self.button1 = Button(self.master, text="Click Me 1", command = self.Open1) 
     self.button1.grid(row=0, column=0, sticky=W) 
     self.button2 = Button(self.master, text="Click Me 2", command = self.Open2) 
     self.button2.grid(row=0, column=2, sticky=W) 
     self.button3 = Button(self.master, text="Close", command = self.Close) 
     self.button3.grid(row=1, column=0, sticky=W) 


    def Open1(self): 
     second_window = Toplevel(self.master) 
     window2 = Second(second_window) 

    def Open2(self): 
     third_window = Toplevel(self.master) 
     window3 = Third(third_window) 

    def Close(self): 
     self.master.destroy() 


class Second(): 

    def __init__(self, master): 
     self.second_window = second_window 
     self.master.title("Second Window") 

class Third(): 

    def __init__(self, master): 
     self.master = master 
     self.master.title("Third Window") 


root_window = Tk() 
root_window.geometry("200x85") 
main_window = Main(root_window) 
root_window.mainloop() 

然而，這兩個頂級窗口的創建也可以不帶參數的書面...它似乎產生相同的結果：

def Open1(self): 
      second_window = Toplevel() 
      window2 = Second(second_window) 

     def Open2(self): 
      third_window = Toplevel() 
      window3 = Third(third_window) 

那麼，爲什麼我們在實例化頂層窗口時通常會傳遞此根窗口的屬性？

Answer 1

除根窗口以外的所有窗口小部件都需要父窗口。這就是tkinter的工作原理。如果您未傳入父級，則默認爲根窗口。

Python的禪說，顯式比隱式更好。明確地通過它可以防止人們不得不問這個問題，並使代碼稍微容易理解。