Python: Resize an existing array and fill with zeros

Question

I think that my issue should be really simple, yet I can not find any help on the Internet whatsoever. I am very new to Python, so it is possible that I am missing somethin

Answer 1

Another pure python solution is

a = [1, 2, 3]
b = []
for i in range(6):
    b.append((([0] * i) + a[i:i+1] + ([0] * (len(a) - 1 - i)))[:len(a)])

b is now

[[1, 0, 0], [0, 2, 0], [0, 0, 3], [0, 0, 0], [0, 0, 0], [0, 0, 0]]

it's a hideous solution, I'll admit that. However, it illustrates some functions of the list type that can be used.