Further reading about the relationship between recursion, iteration, and accumulators: https://blog.moertel.com/posts/2013-05-11-recursive-to-iterative.html htt

Further reading about the relationship between recursion, iteration, and accumulators: https://blog.moertel.com/posts/2013-05-11-recursive-to-iterative.html https://blog.moertel.com/posts/2013-05-11-recursive-to-itera... This transformation is one you can apply in your own source as well. An example from that link, the recursive def factorial(n): if n < 2: return 1 return n * factorial(n - 1) can be rewritten iteratively: def factorial1d(n, acc=1): while n > 1: (n, acc) = (n - 1, acc * n) return acc