Другой способ:
result = [[0, 0]] * 20
print (result)
#[[0, 0], [0, 0], [0, 0], [0, 0], [0, 0], [0, 0], [0, 0], [0, 0], [0, 0], [0, 0], [0, 0], [0, 0], [0, 0], [0, 0], [0, 0], [0, 0], [0, 0], [0, 0], [0, 0], [0, 0]]
result = [[[0], [0]]] * 20
print (result)
#[[[0], [0]], [[0], [0]], [[0], [0]], [[0], [0]], [[0], [0]], [[0], [0]], [[0], [0]], [[0], [0]], [[0], [0]], [[0], [0]], [[0], [0]], [[0], [0]], [[0], [0]], [[0], [0]], [[0], [0]], [[0], [0]], [[0], [0]], [[0], [0]], [[0], [0]], [[0], [0]]]