name : entry-with-shared-variable.py from Tkinter import * import string # This program shows how to make a typein box shadow a program variable. class App(Frame): def __init__(self, master=None): Frame.__init__(self, master) self.pack() self.entrythingy = Entry(self) self.entrythingy.pack() self.button = Button(self, text="Uppercase The Entry", command=self.upper) self.button.pack() # here we have the text in the entry widget tied to a variable. # changes in the variable are echoed in the widget and vice versa. # Very handy. # there are other Variable types. See Tkinter.py for all # the other variable types that can be shadowed self.contents = StringVar() self.contents.set("this is a variable") self.entrythingy.config(textvariable=self.contents) # 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 upper(self): # notice here, we don't actually refer to the entry box. # we just operate on the string variable and we # because it's being looked at by the entry widget, changing # the variable changes the entry widget display automatically. # the strange get/set operators are clunky, true... str = string.upper(self.contents.get()) self.contents.set(str) def print_contents(self, event): print "hi. contents of entry is now ---->", self.contents.get() root = App() root.master.title("Foo") root.mainloop()