Put objects in a grid, Python

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Python

grid

Hello, I have created a fully functioning grid with player movements in python. Although I need some help placing treasure chests around the map. The user needs to be asked how much treasure chests will be placed into the grid, then that amount of treasure chests will be placed randomly on the map. Could anyone help me with this?

What I have tried:

def setupGrid():
    N = int(input("How big would you like the grid to be?"))
    for x in range(0, N):
        row = []
        for y in range(0, N):
            if x == player_loc[0] and y == player_loc[1]:
                row.append(character)
            else:
                row.append('O')
        grid.append(row)

def moveSouth(n):
    global player_loc
    grid[player_loc[0]][player_loc[1]] = "O"
    grid[player_loc[0] + n][player_loc[1]] = character
    player_loc = (player_loc[0] + n, player_loc[1])

def moveNorth(n):
    global player_loc
    grid[player_loc[0]][player_loc[1]] = "O"
    grid[player_loc[0] - n][player_loc[1]] = character
    player_loc = (player_loc[0] - n, player_loc[1])

def moveEast(n):
    global player_loc
    grid[player_loc[0]][player_loc[1]] = "O"
    grid[player_loc[0]][player_loc[1] + n] = character
    player_loc = (player_loc[0], player_loc[1] + n)

def moveWest(n):
    global player_loc
    grid[player_loc[0]][player_loc[1]] = "O"
    grid[player_loc[0]][player_loc[1] - n] = character
    player_loc = (player_loc[0], player_loc[1] - n)

def gridRunner():
    while True:
        for row in grid:
            print (row)

        switch = {NORTH : moveNorth,
                  SOUTH : moveSouth,
                  EAST  : moveEast,
                  WEST  : moveWest }
        P = input("What direction would you like to move in? North (N), South(S), East(E) or West(W)?").upper()

        if P not in switch:
            print ("invalid move")
            continue

        distance = int(input("How far would you like to move in this direction? (blocks are the units)"))
        switch[P](distance)

setupGrid()
gridRunner()