pascal_iterative

def pascal(n):
    yield [1]
    row = [1, 1]
    yield row
    for _ in range(n):
        row = [1] + [row[i] + row[i+1] for i in range(len(row) - 1)] + [1]
        yield row

print('\n'.join(str(i) for i in list(pascal(5))))