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Dir : ~/proc/7568/cwd/lib64/python2.7/Demo/tkinter/matt/

Edit File: 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()