Using Tkinter to create rectangles for each cell of a 2d array

Question

I've created a 2d array like this:

a, b = 150, 150;
density = .5

def RedOrGreen():
  c = random.uniform(0,1)
  if c > density:
    d = "GREEN"
  else:
    d = "RED"
  return d

Matrix = [[RedOrGreen() for x in range(a)] for y in range(b)]

I'd like to use tkinter to create a square that has a lot of squares inside of it. These squares are represented by my 2d array. I want to make them either green or red, depending on the value in the 2d array. I tried to accomplish this by iterating through my 2d array, and creating rectangles like this:

        self.forest = tk.Canvas(self, width = 500, height = 500)
        for x in range(a):
            for y in range(b):
                self.forest.create_rectangle(x,y,x+1,y+1, fill = Matrix[x][y])
        self.forest.pack()

I've omitted some code for simplicity, but you can view the entire code here: https://repl.it/repls/WindingUnwelcomeLibrary

However, this solution does not work. I'm not sure why it's not working, because in my head I am iterating through the 2d array, and then creating a corresponding rectangle. Please let me know if you have any ideas.

Edit: The reason it does not work is because it just displays a black canvas. It's not correctly populating the rectangles with the colors I want. I am not running it on repl.it, I just have it there to display the full code.

Answer 1

Every rectangle has black border which hides other rectangles. And finally you have only black canvas.

You have to remove border using width=0

 self.forest.create_rectangle(x, y, x+1, y+1, fill=Matrix[x][y], width=0)

Doc: Canvas