python - Cannot use geometry manager pack inside

Question

So I'm making an rss reader using the tkinter library, and in one of my methods I create a text widget. It displays fine until I try to add scrollbars to it.

Here is my code before the scrollbars:

   def create_text(self, root):
        self.textbox = Text(root, height = 10, width = 79, wrap = 'word')
        self.textbox.grid(column = 0, row = 0)

Here is my code after:

def create_text(self, root):
        self.textbox = Text(root, height = 10, width = 79, wrap = 'word')
        vertscroll = ttk.Scrollbar(root)
        vertscroll.config(command=self.textbox.yview)
        vertscroll.pack(side="right", fill="y", expand=False)
        self.textbox.config(yscrllcommand=vertscroll.set)
        self.textbox.pack(side="left", fill="both", expand=True)
        self.textbox.grid(column = 0, row = 0)

This gives me the error

_tkinter.TclError: cannot use geometry manager pack inside .56155888 which already has slaves managed by grid on the line vertscroll.pack(side="right", fill="y", expand=False)

Any ideas how to fix this?

Answer 1

Per the docs, don't mix pack and grid in the same master window:

Warning: Never mix grid and pack in the same master window. Tkinter will happily spend the rest of your lifetime trying to negotiate a solution that both managers are happy with. Instead of waiting, kill the application, and take another look at your code. A common mistake is to use the wrong parent for some of the widgets.

Thus, if you call grid on the textbox, do not call pack on the scrollbar.

---

import Tkinter as tk
import ttk

class App(object):
    def __init__(self, master, **kwargs):
        self.master = master
        self.create_text()

    def create_text(self):
        self.textbox = tk.Text(self.master, height = 10, width = 79, wrap = 'word')
        vertscroll = ttk.Scrollbar(self.master)
        vertscroll.config(command=self.textbox.yview)
        self.textbox.config(yscrollcommand=vertscroll.set)
        self.textbox.grid(column=0, row=0)
        vertscroll.grid(column=1, row=0, sticky='NS')

root = tk.Tk()
app = App(root)
root.mainloop()