Odd behavior in Python/Tkinter?

[Lie]

On Dec 22, 1:42 pm, Fredrik Lundh <fred... at pythonware.com> wrote:
> Lie wrote:
> >>> Inspect the following code:
>
> >>> --- start of code ---
> >>> import Tkinter as Tk
> >>> from Tkconstants import *
> >>> root = Tk.Tk()
> >>> e1 = Tk.Entry(root, text = 'Hello World')
> >>> e2 = Tk.Entry(root, text = 'Hello World')
>
> >> the "text" (or "textvariable") option to the Entry widget is the name of
> >> the Tcl variable that should hold the result.
>
> >> to get something that's a bit more usable from Python, use a StringVar
> >> instance instead.  alternatively, use the "get" method to fetch text
> >> from the widget, and the "insert" method to add text to it.
> > I realized that 'text' isn't a normally valid arguments for Entry (and
> > I'm also aware about the insert, get, etc), but what makes me creep is
> > the fact that the Entry's value would mirror each other if they're set
> > to the same 'text' value
>
> note that you've set the "textvariable" option, not the "text" option.
> Tk allows you to abbreviate option names.
>
> and since you've set the "textvariable" option for both widgets to the
> same variable, you've asked them both to display the same variable.
> Tkinter just does what you've asked it to.
>
> this is no different from using a Tkinter variable to display the same
> value in a number of radiobutton widgets.
>
> </F>

But an expression (e.g. string) is NOT a variable. It's fine if the
value mirrored when I set the textvariable conf to the same variable,
but in this case I'm setting them to the same expression (e.g. string).