Tkinter reference: a GUI for Python

Here is a trivial Tkinter program containing only a Quit button:

#!/usr/local/bin/python     
from Tkinter import *       

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

    def createWidgets(self):
        self.quitButton = Button ( self, text="Quit",
            command=self.quit )        
        self.quitButton.grid()         

app = Application()                    
app.master.title("Sample application") 
app.mainloop()                         

	This line makes the script self-executing, assuming that your system has the Python interpreter at path /usr/local/bin/python.
	This line imports the entire Tkinter package into your program's namespace.
	Your application class must inherit from Tkinter's Frame class.
	Calls the constructor for the parent class, Frame.
	Necessary to make the application actually appear on the screen.
	Creates a button labeled “Quit”.
	Places the button on the application.
	The main program starts here by instantiating the Application class.
	This method call sets the title of the window to “Sample application”.
	Starts the application's main loop, waiting for mouse and keyboard events.