Using a Frame class in a Tk class in Python tkinter

Question

In the below example, I am trying to use Frame1() in MainW(). I tried many variations of the below code. The problem is that the frame object color and rowspan are not changing at all. I know there is a problem in terms of using Frame1() in MainW(). Can someone point out the error?

from tkinter import *

class Frame1(Frame):
        def __init__(self, parent):
            Frame.__init__(self, parent, bg="red")
            self.parent = parent
            self.widgets()
        def widgets(self):
            self.text = Text(self)
            self.text.insert(INSERT, "Hello World\t")
            self.text.insert(END, "This is the first frame")
            self.text.grid(row=0, column=0)


class MainW(Tk):
    def __init__(self, parent):
        Tk.__init__(self, parent)
        self.parent = parent
        self.mainWidgets()
    def mainWidgets(self):
        self.label = Label(self, text="Main window label")
        self.label.grid(row=0, column=0)
        self.window = Frame1(self)
        self.window.grid(row=0, column=10, rowspan=2)

if __name__=="__main__":
    app = MainW(None)
    app.mainloop()

Here is the output which is not what I want. I need the frame's background red and rowspan to be 1:

Thank you

Answer 1

You can't see frame color because you put widget which fills all frame.

If you add margins ( padx , pady ) then you can see frame color.

self.text.grid(row=0, column=0, padx=20, pady=20)

You can't see rowspan because you have empty cell is second row. Empty cell has no width and height. Add Label in second row and will see how rowspan works.

from tkinter import *

class Frame1(Frame):
    def __init__(self, parent):
        Frame.__init__(self, parent, bg="red")
        self.parent = parent
        self.widgets()

    def widgets(self):
        self.text = Text(self)
        self.text.insert(INSERT, "Hello World\t")
        self.text.insert(END, "This is the first frame")
        self.text.grid(row=0, column=0, padx=20, pady=20) # margins


class MainW(Tk):

    def __init__(self, parent):
        Tk.__init__(self, parent)
        self.parent = parent
        self.mainWidgets()

    def mainWidgets(self):

        self.label1 = Label(self, text="Main window label", bg="green")
        self.label1.grid(row=0, column=0)

        self.label2 = Label(self, text="Main window label", bg="yellow")
        self.label2.grid(row=1, column=0)

        self.window = Frame1(self)
        self.window.grid(row=0, column=10, rowspan=2)

if __name__=="__main__":
    app = MainW(None)
    app.mainloop()