Is it necessary to call Tk() when writing a GUI app with Tkinter?

Thu Mar 1 00:24:06 EST 2012

On 2/29/2012 10:22 PM, Rick Johnson wrote:
I do not know what book the OP is referring to,
but the current doc example is
http://docs.python.org/py3k/library/tkinter.html#a-simple-hello-world-program
My current replacement (see below) can be downloaded from the tracker:
http://bugs.python.org/issue14163
> If you want to keep things simple, i would:
>> 1. Create the root window explicitly!

It already does that.
> 2. Bind the command of the button to root.destroy
> (command=root.destroy)

That works great. My current replacement example is uploaded to the 
issue http://bugs.python.org/issue14163
> PS: I would highly suggest against using the "from Tkinter import *".
> Instead, use "import Tkinter as tk" and prefix all module contents
> with "tk.".

I have changed the example to do that. I also showed the alternate to 
initialize a widget. Here is the current version, tested on Windows 3.2.2.
import tkinter as tk
class Application(tk.Frame):
 def __init__(self, master=None):
 tk.Frame.__init__(self, master)
 self.pack()
 self.createWidgets()
 def createWidgets(self):
 self.hi_there = tk.Button(self)
 self.hi_there["text"] = "Hello_World\n(click_me)",
 self.hi_there["command"] = self.say_hi
 self.hi_there.pack({"side": "top"})
 self.QUIT = tk.Button(self, text = "QUIT", fg = "red", command 
= root.destroy)
 self.QUIT.pack({"side": "bottom"})
 def say_hi(self):
 print("hi there, everyone!")
root = tk.Tk()
app = Application(master=root)
app.mainloop()
There is a minor problem left. The hi_there Button text has underscores 
because if I use spaces instead, tk surrounds the text with {bra ces}. 
This seems bizarre. Is there any way to have Button text with spaces and 
no braces?
-- 
Terry Jan Reedy