new

from tkinter import *

class Main:

    def __init__(self):
        main   = Tk()
        self.x = 0

        Button(main,text=self.x,command=self.xplus1()).pack()
        Button(main,text='Quit',command=main.destroy ).pack()
        mainloop()

    def xplus1(self):
        self.x = self.x + 1

Main()