Python Tkinter question

[Thyme]

I've hit a bump learning to use Tkinter. Nothing I've found on line
has helped me nail down the problem. Any insights would be welcome.

This is something very easy, actually - I'm trying to use the feature
a label is assigned a variable so that it can be automatically
updated. I followed the syntax I found in a Tkinter PDF on line and
another online doc I found.

Here is some code:

# File: testx.py
from Tkinter import *

con1 = StringVar("Quick Question!")

class App:
	def __init__(self, master):
		frame = Frame(master)
		frame.pack()
		self.label1 = Label(master, textvariable=con1)
		self.label1.pack()

root = Tk()
app = App(root)
root.mainloop()

When I run this, I get the following error:

C:\python\SizeOf>python testx.py
Traceback (most recent call last):
  File "testx.py", line 4, in ?
    con1 = StringVar("Quick Question!")
  File "C:Python22\lib\lib-tk\Tkinter.py", line 217, in __init__
    Variable.__init__(self, master)
  File "C:Python22\lib\lib-tk\Tkinter.py", line 171, in __init__
    self._tk = master.tk
AttributeError: 'str' object has not attribute 'tk'
Exception exceptions.AttributeError: "StringVar instance has no
attribute '_tk'" in <bound method StringVar.__del__ of
<Tkinter.StringVar instance at 0x008B2D40>> ignored