Custom left and right delimiters to flatten?

[wreleven]

I've customized flatten to allow for a two custom delimiters. I needed to be able to create post variables for a PHP api and your flatten function was the simplest thing to customize.

def flatten(o, left='.', right=''):

    left    = '%s' % left
    right   = '%s' % right
    stack   = [(wrap(o).iteritems(), None)]

    while stack:
        items_iter, parent_key = stack[-1]
        for (key, value) in items_iter:
            if parent_key is None:
                full_key = key
            else:
                full_key = left.join([parent_key, '%s%s' % (key, right)] )
            if value is not unwrap(value):
                stack.append((iter(value.items()), full_key))
                break
            yield full_key, value
        else:
            stack.pop()