from ipythonblocks import BlockGrid
grid = BlockGrid(10, 10, fill=(123, 234, 123))
grid

bottom = []
for i in range(10):
    bottom.append(grid[9,i])


right = []
for i in range(10):
    right.append(grid[i,9])

even_diagonal = []
for i in range(5):
    even_diagonal.append(grid[2*i,2*i])

# now, color 'em
for item in bottom:
    item.set_colors(255, 0, 0)

for item in right:
    item.set_colors(0, 255, 0)
    
for item in even_diagonal:
    item.set_colors(0, 0, 255)
    
grid

from ipythonblocks import BlockGrid
grid = BlockGrid(10, 10, fill=(123, 234, 123))
grid

d = {}

bottom = []
for i in range(10):
    bottom.append(grid[9,i])

d['bottom'] = bottom

right = []
for i in range(10):
    right.append(grid[i,9])

d['right'] = right
    
even_diagonal = []
for i in range(5):
    even_diagonal.append(grid[2*i,2*i])
d['even_diagonal'] = even_diagonal

for item in d['bottom']:
    item.set_colors(0, 0, 255)

for item in d['right']:
    item.set_colors(0, 0, 255)
    
for item in d['even_diagonal']:
    item.set_colors(0, 0, 255)

grid

def get_diagonal_cells(grid):
    diagonal = []
    # code goes here <--
    return diagonal

# define grid, and then
# 'diag = get_diagonal_cells(grid)' to call the function.