Why does the background color of my Frame not change during the execution of my application in Tkinter, even with the setting of the bg parameter?

Question

    from tkinter import *

class Teste(object):
    def __init__(self):
        mestre = Tk()
        mestre.title("Aplicação de teste")
        mestre.geometry("400x400")
        mestre.resizable(False, False)

        #Frames
        self.frame1 = Frame(mestre, bg = "red")
        self.frame1.pack()
        self.frame2 = Frame(mestre, bg = "blue")
        self.frame2.pack()

        mestre.mainloop()
Teste()

Why, even defining the arguments "red" and "blue" respectively to the background parameter of self.frame1 and self.frame2, does the execution of the program return me a screen with the gray background color? There wasn’t supposed to be a screen split in half, each half with a color?

Thank you.

Answer 1

is that when you create a Frame, by default the Width and its Height is 0, so they are red and blue.

height=

Default is 0. (height/height)

width=

Default value is 0. (width/Width)

So the correct way to create your Frames is as follows:

#Frames
self.frame1 = Frame(mestre, bg = "red", height=200, width=400)
self.frame2 = Frame(mestre, bg = "blue", height=200, width=400)

has a very good site that helps when looking for references to the Tkinter called Effbot. http://effbot.org/tkinterbook