Question

I cannot update the rows in Tkinter.

If I set the rows to a regular variable it doesn’t not update. this is shown in the first script.
If I set the rows to the IntVar type like you would do with text it refuses the data type. This is shown in the second script.

2 things to note:
If you watch the counter in script 1, its going up just fine but its not being applied.
If you use self.activeRow.get() instead of self.activeRow it will effectively turn it into a normal variable with the same results shown in script 1.

Script 1

from tkinter import *

class Example(Frame):

    def move(self):
        self.activeRow += 1
        print(self.activeRow)

    def __init__(self, parent):
        Frame.__init__(self, parent)   
        self.parent = parent
        self.initUI()

    def initUI(self):

        self.columnconfigure(0, pad=0)      
        self.columnconfigure(1, pad=0)
        self.columnconfigure(2, pad=0) 
        self.rowconfigure(0, pad=0)
        self.rowconfigure(1, pad=0)
        self.rowconfigure(2, pad=0)

        Label(self, text= 'row 0').grid(row=0, column=0)
        Label(self, text= 'row 1').grid(row=1, column=0)
        Label(self, text= 'row 2').grid(row=2, column=0)

        #regular variable
        self.activeRow = 0
        b = Button(self, text="normal variable {0}".format(self.activeRow), command=self.move)
        b.grid(row=self.activeRow, column=1)


        self.pack()




def main():
    root = Tk()
    app = Example(root)
    root.mainloop()  


if __name__ == '__main__':
    main()  

Script 2

from tkinter import *

class Example(Frame):

    def move(self):
        self.activeRow.set(self.activeRow.get() + 1)
        print(self.activeRow.get())

    def __init__(self, parent):
        Frame.__init__(self, parent)   
        self.parent = parent
        self.initUI()

    def initUI(self):

        self.columnconfigure(0, pad=0)      
        self.columnconfigure(1, pad=0)
        self.columnconfigure(2, pad=0) 
        self.rowconfigure(0, pad=0)
        self.rowconfigure(1, pad=0)
        self.rowconfigure(2, pad=0)

        Label(self, text= 'row 0').grid(row=0, column=0)
        Label(self, text= 'row 1').grid(row=1, column=0)
        Label(self, text= 'row 2').grid(row=2, column=0)

        #Tkinter IntVar
        self.activeRow = IntVar()
        self.activeRow.set(0)


        b = Button(self, text="IntVar", command=self.move)
        b.grid(row=self.activeRow, column=1)


        self.pack()

Answer 1

If you want to move an existing widget, you have to call again the grid method to update this widget (ie widget.grid(row=other_value)). To remove a widget, you can use the grid_forget() method.

from Tkinter import *

class Example(Frame):
    def __init__(self, parent):
        Frame.__init__(self, parent)
        self.initUI()

    def move(self):
        info = self.b.grid_info()
        previous_row = int(info["row"]) #int() needed because datas are stored as string
        self.b.grid(row=previous_row+1)

    def initUI(self):
        for i in range(5):
            l = Label(self, text="Row {0}".format(i))
            l.grid(row=i, column=0)

        self.b =  Button(self, text="Moving button", command=self.move)
        self.b.grid(row=0, column=1)

        self.pack()

root = Tk()
app = Example(root)
root.mainloop()