Creating our FriendsList class

Begin with a new folder, which will hold all of the code for our chat application. Inside this folder, create a file called friendslist.py. In this file, we will begin writing our FriendsList class:

import tkinter as tk
import tkinter.ttk as ttk


class FriendsList(tk.Tk):
def __init__(self, **kwargs):
super().__init__(**kwargs)

self.title('Tk Chat')
self.geometry('700x500')

self.canvas = tk.Canvas(self, bg="white")
self.canvas_frame = tk.Frame(self.canvas)

self.scrollbar = ttk.Scrollbar(self, orient="vertical", 
                                        command=self.canvas.yview)
self.canvas.configure(yscrollcommand=self.scrollbar.set)

self.scrollbar.pack(side=tk.LEFT, fill=tk.Y)
self.canvas.pack(side=tk.LEFT, expand=1, fill=tk.BOTH)

self.friends_area = self.canvas.create_window((0, 0), 
                            window=self.canvas_frame, anchor="nw")

self.bind_events()

self.load_friends()

Hopefully everything here looks very familiar. We import the usual...