Why destroy() method doesn't work in my tkinter program?

Question

why, when I use the destroy() method, the program does not close? I tried to use Nick.destroy(), root.destroy() and self.destroy() and none of them work. Tries to close the window when the user types in the correct nickname and passes it out of class

from tkinter import *

class Nick(Frame):
    def __init__(self, master):
        super(Nick, self).__init__(master)
        self.master = master
        self.grid()
        self.mes = None
        self.count = 0
        self.lbl = Label(self, text="WPROWADZ NICK").grid(row=1, column=1)
        self.ent =Entry(self)
        self.ent.grid(row=2, column=1)
        btn = Button(self, text="Akceptuj", command=self.accept)
        btn.grid(row=2, column=2)
        self.error = Label(self, text="")
        self.error.grid(row=3, column=1)

    def accept(self):
        self.mes = self.ent.get()
        if len(self.mes) == 0:
            self.error.config(text="Nick nie moze byc pusty")
        elif " " in self.mes:
            self.error.config(text="Nick nie moze zawierac spacji")
        else:
            global mes
            mes = self.mes
            Nick.destroy()
        if self.count == 0:
            self.error.config(text="")
            self.count+=1

def main_tk():
    root = Tk()
    root.title("ONLINE CHAT")
    root.geometry("260x100")
    app = Nick(root)
    root.mainloop()

main_tk()
print(mes)

Answer 1

The quickest fix would be to replace Nick.destroy() with self.master.destroy()

This is why the ones you've tried do not work:

• Nick.destroy() : Nick class has no @classmethod called destroy
• root.destroy() : root is only accessible in the main method and .mainloop is blocking. So by the time you exit from the main loop (via closing the program, ctrl + c, etc) there's no need to destroy the root.
• self.destroy() : destroying the Nick class would only destroy the Frame it inherits from and thus and will not close the entire program