Motivation

I wanted a clean way to stitch together multi-lined strings, side by side.

Tree

I was motivated while trying to represent the tree structure of a heap.

def children(i):
    k = 2 * i + 1
    return (k, k + 1)

def show_node(i, tree):
    n = len(tree)
    left, right = children(i)
    s2d = partial(
        Str2D,
        min_width=4, halign='center',
        min_height=2, valign='middle'
    )

    if i >= n:
        return Str2D('')
    else:
        return (
            s2d(tree[i]) /
            (show_node(left, tree) + show_node(right, tree))
        )

nodes = list(range(15))

show_node(0, nodes).box('double')

╔════════════════════════════════╗
║               0                ║
║                                ║
║       1               2        ║
║                                ║
║   3       4       5       6    ║
║                                ║
║ 7   8   9   10  11  12  13  14 ║
║                                ║
╚════════════════════════════════╝