from Tkinter import *
from quitter import Quitter

def fetch():
    print 'Input => "%s"' % ent.get()              # get text
    #ent.delete('0', END)
    ent.insert(END, 'x')
    ent.insert(0, 'x')

root = Tk()
ent = Entry(root)
ent.insert(0, 'Type words here')                   # set text
ent.pack(side=TOP, fill=X)                         # grow horiz

ent.focus()                                        # save a click
ent.bind('<Return>', (lambda event: fetch()))      # on enter key
btn = Button(root, text='Fetch', command=fetch)    # and on button 
btn.pack(side=LEFT)
Quitter(root).pack(side=RIGHT)
root.mainloop()