from Tkinter import *

import string

# This program  shows how to use a simple type-in box

class App(Frame):

    def __init__(self, master=None):

        Frame.__init__(self, master)

        self.pack()

        self.entrythingy = Entry()

        self.entrythingy.pack()

        # and here we get a callback when the user hits return. we could

        # make the key that triggers the callback anything we wanted to.

        # other typical options might be <Key-Tab> or <Key> (for anything)

        self.entrythingy.bind('<Key-Return>', self.print_contents)

    def print_contents(self, event):

        print "hi. contents of entry is now ---->", self.entrythingy.get()

root = App()

root.master.title("Foo")

root.mainloop()