[SOLVED] Subclass of tkinter's Toplevel class doesn't seem to inherit "tk" attribute

Subclass of tkinter's Toplevel class doesn't seem to inherit "tk" attribute

I'm writing a Python application using tkinter GUI. I created the TimestampWindow class which should be one of my Windows and made it extend the Toplevel class of tkinter's library and Window, a custom class where I put common attributes/methods for all my Windows. Unfortunately when I try to call self.title(...) on Window class (from a TimestampWindow instance) I get the following error:

File "/home/ela/elaPythonVirtualENV/PythonScripts/pgnclocker/pgnClocker/gui/windows/Window.py", line 54, in setUp
  self.title(CommonStringsEnum.APP_NAME.value)     
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib/python3.12/tkinter/__init__.py", line 2301, in wm_title
  return self.tk.call('wm', 'title', self._w, string)
       ^^^^^^^
AttributeError: 'TimestampWindow' object has no attribute 'tk'

Things doesn't change if I move the invocation of title method directly in TimestampWindow.

I leave two snippets with a "sketch" of TimestampWindow and Window classes below to clarify the whole thing:

Timestamp Window

import tkinter as tk
from pgnClocker.gui.windows.Window import *
... more imports ...

class TimestampWindow(tk.Toplevel, Window):

    ... code ...

Window

class Window:

    ... code ...

    def setUp(self):
        self.title(CommonStringsEnum.APP_NAME.value)

Could you please help me understand what's going on here? Shouldn't I be able to use TimestampWindow as a tkinter window since it inherits all methods from tk.Toplevel? Why it isn't inheriting tk attribute?

Solution

tk is an attribute of the root window. To access it, you need to pass the master to your class.

import tkinter as tk


class Window:

    def setUp(self):
        self.title("Title")


class TimestampWindow(tk.Toplevel, Window):
    
    def __init__(self, master): # <-
        super().__init__(master) # <-
        print("master:", master, master.call)
        print("self.tk:", self.tk, self.tk.call)
        #master.call('wm', 'title', self, "New title")
        self.tk.call('wm', 'title', self, "New title")
        self.transient(master)
        #self.setUp()

root = tk.Tk()
print("root.tk:", root.tk, root.tk.call)
root.title("Root")
t = TimestampWindow(root) # <-
root.mainloop()