Borders on some sides

You can do this by putting white frames inside a black one and using the padx and pady arguments of grid:

import tkinter as tk root = tk.Tk()frame = tk.Frame(root, bg='black')frames = []for i in range(3):    frames.append([])    for j in range(3):        frames[i].append(tk.Frame(frame, bg='white', width=50, height=50))        frames[i][j].grid(row=i, column=j,                           padx=((j != 0) * 2,  (j != 2) * 2),                          pady=((i != 0) * 2,  (i != 2) * 2))frame.pack()root.mainloop()

padx and pady can either take a single number to get a symmetrical result or a tuple of values:padx=(<left>, <right>) and pady=(<top>, <bottom>).

What about something like this:

# I use python 2import Tkinter as tk # For Python 3 use import tkinter as tk def create_grid(event=None):    w = c.winfo_width() # Get current width of canvas    h = c.winfo_height() # Get current height of canvas    c.delete('grid_line') # Will only remove the grid_line    # Creates all vertical lines at intevals of 100 except for first and last    for i in range(100, w - 100, 100):        c.create_line([(i, 0), (i, h)], tag='grid_line')    # Creates all horizontal lines at intevals of 100 except for first and last    for i in range(100, h - 100, 100):        c.create_line([(0, i), (w, i)], tag='grid_line')root = tk.Tk()c = tk.Canvas(root, height=300, width=300, bg='white')c.pack(fill=tk.NONE, expand=True)c.bind('<Configure>', create_grid)root.mainloop()

I took this answer and tweaked it a bit so the edges won't be shown