为什么我们在创建Toplevel窗口时通过根窗口的'窗口'属​​性？

Question

我正在学习如何使用Okin方法使用tkinter创建父窗口和子窗口，但是在创建Toplevel窗口时不完全理解传递父窗口的“窗口”属性的原因。见下文......

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，这两个顶级窗口的创建也可以不带参数的书面...它似乎产生相同的结果：

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

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

那么，为什么我们在实例化顶层窗口时通常会传递此根窗口的属性？

Answer 1

除根窗口以外的所有窗口小部件都需要父窗口。这就是tkinter的工作原理。如果您未传入父级，则默认为根窗口。

Python的禅说，显式比隐式更好。明确地通过它可以防止人们不得不问这个问题，并使代码稍微容易理解。