iterate_in_steps.py

def iterate_in_steps(seq, n, increment):
    if len(seq) >= n:
        return [tuple(seq[:n])] + iterate_in_steps(seq[increment:], n, increment)
    else:
        return []

# >>> iterate_in_steps([1, 2, 3, 4, 5], 2, 1)
# [(1, 2), (2, 3), (3, 4), (4, 5)]
# 
# >>> iterate_in_steps([1, 2, 3, 4, 5], 3, 2)
# [(1, 2, 3), (3, 4, 5)]