Cannot use geometry manager pack inside

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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()

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