So i just wanted to understand why tkinter is not sticking the sizegrip to the bottom right (SE) of the root window if I dont’t call .columnconfiguration() and .rowconfiguration() methods on the root. It’s behaving in weird ways and I don’t understand why.

When I write:

# ttk app
class Application(ttk.Frame):
    '''
    Main ttk app, inherited from ttk.Frame.
    '''
    def __init__(self, **kwargs):
        super().__init__(**kwargs)

        folderSelector_Frame = ttk.Frame(self)
        self.folderSelector_Treeview = ttk.Treeview(folderSelector_Frame)
        
        outputText_Frame = ttk.Frame(self)
        self.outputText = tk.StringVar(outputText_Frame)
        self.outputText_Label = ttk.Label(outputText_Frame, textvariable= self.outputText)
        
        
        inputParent_Frame = ttk.Frame(self) 
        
        
        
        # Layout
        self.folderSelector_Treeview.pack()
        self.outputText_Label.pack()
        
        folderSelector_Frame.grid(column= 0, row=0)
        outputText_Frame.grid(column= 2, row= 0)
        ttk.Separator(self, orient= "vertical").grid(column= 1, row= 0, sticky= tk.NS)
        inputParent_Frame.grid(column= 4, row= 0)
        ttk.Separator(self, orient= "vertical").grid(column=3, row=0, sticky= tk.NS)
    

def main() -> None:
    '''
    Main, creates tk.Tk() named root and calls instance of Application with root as master, packs Application and runs mainloop on root.
    '''
    root = tk.Tk()
    root.resizable(width= True, height= True)
    root.columnconfigure(0, weight=1)
    root.rowconfigure(0, weight=1)
    
    Application(master= root).grid(column= 0, row= 0)
    ttk.Sizegrip().grid(row= 6, sticky= tk.SE)
    
    
    root.mainloop()
    
if __name__ == "__main__":
    main()

It works but if I were to write:

def main() -> None:
    '''
    Main, creates tk.Tk() named root and calls instance of Application with root as master, packs Application and runs mainloop on root.
    '''
    root = tk.Tk()
    root.resizable(width= True, height= True)
    
    Application(master= root).grid(column= 0, row= 0)
    ttk.Sizegrip().grid(row= 6, sticky= tk.SE)
    
    
    root.mainloop()

The sizegrip gets stuck on the bottom right of the Application frame. Even the resizing logic changes and the Application stays on the top left, while with the previous version it remained in the center

Even if I were to use pack instead of grid it’s still giving problems:

def main() -> None:
    '''
    Main, creates tk.Tk() named root and calls instance of Application with root as master, packs Application and runs mainloop on root.
    '''
    root = tk.Tk()
    root.resizable(width= True, height= True)

    Application(master= root).pack()
    ttk.Sizegrip().pack(anchor= tk.SE)
    
    
    root.mainloop()

In this case, the sizegrip stays at the same y (?) coordinate but sticks to the right border of root, and the replacement logic changes accordingly: Application is centered along the x axis but not the y axis, even though I put tk.SE parameter and not just tk.E.