Tkinter - Scrollbars

As with menu Tkinter widgets, we will need some explanations with Labels what specific widgets are used for:

lab_1 = Label(top_win, text ="Scrolls are Weird")
lab_1.pack(side = TOP, anchor = NW)

Scrollbars must be positioned inside some Tk window: 

scr_bar = Scrollbar(top_win)
scr_bar.pack(side = RIGHT, fill = Y)

Important - now we need Listbox with yscrollcommand that will target Scrollbar, in this case scr_bar:

items = Listbox(top_win, yscrollcommand = scr_bar.set)

If we are lazy to invent items, there is a for loop to populate a list:

for x in range(100):
    items.insert(END, "Item: " + str(x))

Now it's time to pack Listbox with items:

items.pack(side = LEFT, fill = BOTH)

Interesting thing with Scrollbars, they must be configured to target items, using this line:

scr_bar.config(command = items.yview)

This is full working source:

from tkinter import *
import tkinter.messagebox as mb
import os

top_win = Tk()
top_win.geometry("200x200")

lab_1 = Label(top_win, text ="Scrolls are Weird")
lab_1.pack(side = TOP, anchor = NW)

scr_bar = Scrollbar(top_win)
scr_bar.pack(side = RIGHT, fill = Y)

items = Listbox(top_win, yscrollcommand = scr_bar.set)

for x in range(100):
    items.insert(END, "Item: " + str(x))

items.pack(side = LEFT, fill = BOTH)

scr_bar.config(command = items.yview)
top_win.mainloop()

Scrollbars are little bit weird, so definitely check YouTube tutorial on Scrollbars.