I'm a complete newbie to GUI. I have a couple questions about tkinter.
1. Where is the list of changes in Python 3's tkinter? 2. What exactly is the role of the root object, traditionally created as ``root=tk.Tk()``? What is an example where one should create this before creating a Frame instance (which will otherwise implicitly create one as its master)? 2. Suppose I ``import tkinter as tk`` and then try ``s1=tk.StringVar()``. This fails because no "master" is set. Why does a Variable need a master? 3. Now suppose I set ``root = tk.TK()`` and then try ``s1=tk.StringVar()``. This works fine but now seems a bit magical: how has the value of the "master" been set? 4. Another bit of magic: Suppose I ``import tkinter as tk`` and then try ``f1=tk.Frame()``. This works fine: apparently calling Frame also leads to implicit creation of a "master". Why is what is good for the gander (i.e., implicit master creation for a Frame) not good for the goose (i.e., a Variable)? (Here I assume that there has been an answer to 2. above.) 5. Reading around a bit, it seems common to recommend setting the values of Variables rather than initializing them. Why? I cannot see the reason to avoid ``s1=tk.StringVar(value="this works fine")`` and it looks like ``tk.StringVar(()`` is in any case initialized (to an empty string). 6. Why is str(s1) not its value? More generally, why does a StringVar not behave more like a string? Thanks for any insights, Alan Isaac -- http://mail.python.org/mailman/listinfo/python-list
