from tkinter import * 

class Application(Frame):
    def __init__(self , master=None):
        Frame.__init__(self , master)
        self.pack()
        self.createWidgets()

    def createWidgets(self) : 
        self.helloLabel = Label(self , text = "hello , world!")
        self.helloLabel.pack()
        self.quitButton = Button(self , text="Quit" , command=self.quit)
        self.quitButton.pack()

app = Application()
app.master.title('Hello World')
app.mainloop()