[Tutor] Tkinter + frame + grid question

[Peter Otten]

Phil wrote:

> Thank you for reading this.
> 
> I'd like to place a red frame in the centre of the main window.
> 
> I've discovered two ways to achieve this using place() and pack(padx,
> pady). Grid() does not give the desired result.
> 
> Next I'd like to place some widgets on the frame. Again place() does what
> I want and pack() almost does except the red frame is the size of the
> padding. It now seems to me that this is the way it's supposed to work.
> I'd like to use grid(), but so far, all that I can achieve is to place
> widgets on the main window and not the frame. The frame does not display
> if I use grid().
> 
> I've spent hours on this and an Internet search has not helped at all.
> However, I did learn that grid() and pack() are not compatible, could this
> be the problem? Perhaps I have to let go of the familiar grid() method and
> use pack() instead? Place() does exactly what I want but it's a bit
> cumbersome to use. The more I think about it, the more I think pack() is
> the go.
> 
> Still, I'd like to know, what's the best method?

place() is a pain if the screen or font size differs from what you expect.
I use grid() almost exclusively, but I have to admit that I always have to 
play around a bit until I get something close to what I want.

> 
> The following is a summary of what I've tried:
> 
> from tkinter import *
> 
> class App:
> 
>     def __init__(self, master):
>         master.geometry('400x400+50+50')
>         frame = Frame(master, width = 300, height = 300, bg = 'red')
>         
>         frame.pack(pady = 50)
>         #frame.place(x = 50, y = 50)
>         
>         
>         Entry(frame).place(x = 100, y = 100, anchor = CENTER)
>         #Entry(frame).pack(padx = 20, pady = 20)
>         #Entry(frame).grid(row = 10, column = 1)
> 
>         #Entry2 = Entry
>         #Entry2(frame).grid(row = 20, column = 1)

Columns and rows are logical columns; typically you will use 0 and 1 rather 
than 10 and 20.

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

Here's a grid()-based contender:

class App:
    def __init__(self, master):
        master.columnconfigure(0, weight=1)
        master.rowconfigure(0, weight=1)

        frame = Frame(master, bg="red")
        frame.grid(row=0, column=0, padx=30, pady=30, sticky="nsew")
        frame.rowconfigure(0, weight=1)

        entry = Entry(frame)
        entry.grid(row=0, column=0, padx=30, pady=30)