_tkinter.TclError: cannot use geometry manager grid inside . which already has slaves managed by packenter code here

Question

I'm trying to create a child widget based on Entry widget. Unfortunately it's not working as I think it should. From the following code:

import tkinter as tk

WINDOW_WIDTH = 800
WINDOW_HEIGHT = 600


class Application(tk.Frame):

    def __init__(self, master=None):
        tk.Frame.__init__(self, master)
        self.pack()
        self.createWidgets()

    def createWidgets(self):
        self.hi_there = tk.Button(self)
        self.hi_there["text"] = "SOLVE"
        self.hi_there.grid(row=1, column=1)

        self.QUIT = tk.Button(
            self, text="QUIT", fg="red", command=self.master.quit)
        self.QUIT.grid(row=1, column=2)

        # self.number_box = tk.Entry(self) # This is working
        self.number_box = NumberBox(self)  # this is not working
        self.number_box.grid(row=2, column=1)


class MainWindow():

    def __init__(self):
        #self.root = tk.Tk()
        self.app = Application()
        self.app.master.title("SUDOKU")
        self.app.master.minsize(width=WINDOW_WIDTH, height=WINDOW_HEIGHT)
        self.app.master.maxsize(width=WINDOW_WIDTH, height=WINDOW_HEIGHT)
        self.app.mainloop()


class NumberBox(tk.Entry):

    def __init__(self, master=None, cnf={}, **kw):

        super().__init__(cnf, kw)
        #self.text = tk.StringVar()


window = MainWindow()

I get an error:

Traceback (most recent call last): File "E:/workspace/python/sudoku/gui/guitk.py", line 42, in <module> window = MainWindow() File "E:/workspace/python/sudoku/gui/guitk.py", line 28, in __init__ self.app = Application() File "E:/workspace/python/sudoku/gui/guitk.py", line 11, in __init__ self.createWidgets() File "E:/workspace/python/sudoku/gui/guitk.py", line 22, in createWidgets self.number_box.grid(row=2, column=1) File "C:\Python34\lib\tkinter\__init__.py", line 2057, in grid_configure + self._options(cnf, kw)) _tkinter.TclError: cannot use geometry manager grid inside . which already has slaves managed by packenter code here

When I use Entry class directly (not the NumberBox, see commented line), code is working. What do I wrong with inheritance from Entry that my class is not working properly.

Please fix your indentation. Pretty good question otherwise. — Eric Levieil, May 08 '15 at 09:16
If I replace self.pack() by self.grid(), your code is working on my computer(Python 3.4.1 |Anaconda 2.1.0 (64-bit) — Eric Levieil, May 08 '15 at 09:23
Self.pack() is working, but this is not solution for me. I want to use grid layout. — macc, May 08 '15 at 10:10
Yes, it was the only one occurrence of self.pack(), I forgot to change it, anyway strange that it was working. — macc, May 08 '15 at 13:45
Possible duplicate of [Cannot use geometry manager pack inside](https://stackoverflow.com/questions/23584325/cannot-use-geometry-manager-pack-inside) — Stevoisiak, Feb 14 '18 at 21:12

score 2 · Accepted Answer · answered May 08 '15 at 09:43

2

Your super() call looks wrong. You need to pass the parent widget and pass unpacked keyword arguments, like this:

super().__init__(master, cnf, **kw)

answered May 08 '15 at 09:43

mhawke

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_tkinter.TclError: cannot use geometry manager grid inside . which already has slaves managed by packenter code here

1 Answers1