Tkinter spacing

[Peter Otten]

high5storage at gmail.com wrote:

>> from tkinter import *
>> from tkinter import ttk
>> 
>> root = Tk()
>> root.geometry("822x600+100+100")
>> nav_bar = ttk.Frame(root, borderwidth=2, relief='ridge', padding=(10, 3,
>> 10, 3))
>> 
>> btn_first  = ttk.Button(nav_bar, text='|<', width=4)  # for buttons
>> root.mainloop()
> 
> Hmm - this only gives me an empty window (no errors).

That's strange. 

If you ran the script in Idle, try again from the commandline.

> What puzzles me that every book/site on tkinter strongly warns of mixing
> pack and grid managers...

You can mix pack and grid for one window, but you have to pick one layout 
manager per parent widget:

top = Toplevel(root)

panel = Frame(top)
panel.pack(...) 
# we picked pack() and now have to use it for all
# children of top
canvas = Canvas(top, ...)
canvas.pack(...) # must use pack() again

# we are free to pick a layout for panel
ok = Button(panel)
ok.grid(...)
# we picked grid() and now have to use it for all 
# children of panel
cancel = Button(panel)
cancel.grid(...) # must use grid()