Question

I would like to refresh tk window when I push a button, but I have been striking out. Help would be appreciated. Below is what I have tried. I would like the tk.Label line to update when I change the input box and hit refresh, but it isn’t happening.

import Tkinter as tk

class MAIN(object):
    def __init__(self, master, **kwargs):
        frame = tk.Frame(master, borderwidth=5)
        frame.grid()
        et1 = tk.Entry(frame)
        et1.insert(0, '10')
        et1.grid(row=0,column=0,sticky=tk.W)
        tk.Label(frame, text = et1.get()).grid(row=1, column=0, sticky=tk.W)
        refresh = tk.Button(frame, text='Refresh', command = frame.update())
        refresh.grid(row=2, column=0, sticky=tk.W)

root=tk.Tk()
app=MAIN(root)
root.mainloop()

Any Help would be greatly appreciated. Thanks

Edit:

I have also tried to use the update_idletasks(), but that didn’t work either.

Answer from sc0tt’s help:

import Tkinter as tk

class MAIN(object):
    def __init__(self, master, **kwargs):
        frame = tk.Frame(master, borderwidth=5)
        frame.grid()
        self.et1 = tk.Entry(frame)
        self.et1.insert(0, 10)
        self.et1.grid(row=0,column=0,sticky=tk.W)
        self.label_contents = tk.StringVar()
        self.label_contents.set(self.et1.get())
        tk.Label(frame, textvariable=self.label_contents).grid(row=1, column=0, sticky=tk.W)
        refresh = tk.Button(frame, text='Refresh', command = self.refresh_hit)
        refresh.grid(row=2, column=0, sticky=tk.W)

    def refresh_hit(self):
        self.label_contents.set(self.et1.get())

root=tk.Tk()
app=MAIN(root)
root.mainloop()

Answer 1

calling update/update_idletasks won’t do that for you. Here is a way of doing it using a simple lambda in the command for the button. It takes the value of the text box and alters the variable associated with the label.
import Tkinter as tk

class MAIN(object):

    def __init__(self, master, **kwargs):
        frame = tk.Frame(master, borderwidth=5)
        frame.grid()
        et1 = tk.Entry(frame)
        et1.insert(0, 10)
        et1.grid(row=0,column=0,sticky=tk.W)
        label_contents = tk.StringVar()
        label_contents.set(et1.get())
        tk.Label(frame, textvariable=label_contents).grid(row=1, column=0, sticky=tk.W)
        refresh = tk.Button(frame, text='Refresh', command = self.refresh_clicked)
        refresh.grid(row=2, column=0, sticky=tk.W)

    #per comments:
    def refresh_clicked(event):
        #update labels here
root=tk.Tk()
app=MAIN(root)
root.mainloop()

Edit: lambda replaced by function call.