[Tutor] Tkinter layout question

[Phil]

On Sun, 23 Apr 2017 09:52:16 +0200
Peter Otten <__peter__ at web.de> wrote:

> If you wrote the above with Buttons instead of DisplayTables you'd
> encounter the same behaviour. The problem is that you call
> tkinter.Tk() twice (which is generally a recipe for disaster; if you
> want multiple windows use tkinter.Toplevel() for all but the first
> one). 
> 
> Once you have fixed that you should be OK:
> 
> import tkinter as tk
> import table_class
> 
> root = tk.Tk()
> 
> tab = table_class.DisplayTable(root,
>                     ["Left","middle","Right"],
>                     [[1,2,1],
>                     [3,4,3],
>                     [5,6,5]],
>                     datacolor='blue',
>                     cellcolor='yellow',
>                     gridcolor='red',
>                     hdcolor='black')
> 
> second_tab = table_class.DisplayTable(root,
>                     ["Left","middle","Right"],
>                     [[1,2,1],
>                     [3,4,3],
>                     [5,6,5]],
>                     datacolor='blue',
>                     cellcolor='green',
>                     gridcolor='red',
>                     hdcolor='black')
> 
> tab.pack(side=tk.LEFT)
> second_tab.pack()
> 
> root.mainloop()

Thank you again Peter. Of course your changes worked but at the moment I'm not sure why.

if root = tk.Tk() then why isn't table_class.DisplayTable(root, the same as table_class.DisplayTable(tk.Tk(),. Obviously it isn't but I don't know why.

Also I found that root.mainloop() isn't necessary in that the result is the same with or without. Perhaps it serves some other purpose?

-- 
Regards,
Phil