I have defined Class GUI which creates a button with a YES text on it.
I do not understand how I should pass the command to it when the function is defined outside of the Class.

import tkinter as tk
from tkinter import ttk
import pdb
from tkinter import *

def changeButtonText():
    input_bt['text'] = 'No'
    input_bt['relief'] = 'sunken'

class GUI: 
    def __init__(self, master) -> None: 
        root.title('Learning TKinter')
        root.resizable(False, False)
        color = '#aeb3b0'
        root.geometry("100x100")
        root.configure(bg=color)
        # Instantiating master i.e toplevel Widget 
        self.master = master 
        # Creating Button
        input_bt = Button(self.master, text='Yes',width=8,command="") # how to add command 'changeButtonText' here?
        input_bt.place(relx=0.1, rely=0.2)
        input_bt['relief'] = 'raised'

root = tk.Tk()
gui = GUI(root)
root.mainloop() # original working place for root

Basically I want to press the Button so that it goes from Yes to No; and relief raised to sunken.
And i need to do this via Class/Object since I am trying to learn about these.
I am new to Python Class Object material and would appreciate help to get me going on this.

Thank you

I tried using ‘command = self.changeButtonText’:

input_bt = Button(self.master, text='Yes',width=8,command=self.changeButtonText) # how to add command 'changeButtonText' here?

But it is giving me this error:
AttributeError: ‘GUI’ object has no attribute ‘changeButtonText’