human
I wrote the below code

    graphstyle.update(kwargs)
    nodes = []
    edges = []
    def traverse(e, depth, pos=()):
        nodes.append(dotnode(e, styles, labelfunc=labelfunc, pos=pos, repeat=repeat))
        if (maxdepth and (depth >= maxdepth)):
            return
        edges.extend(dotedges(e, atom=atom, pos=pos, repeat=repeat))
        [traverse(arg, (depth + 1), (pos + (i,))) for (i, arg) in enumerate(e.args) if (not atom(arg))]
    traverse(expr, 0)
    return (template % {'graphstyle': attrprint(graphstyle, delimiter='\n'), 'nodes': '\n'.join(nodes), 'edges': '\n'.join(edges)})

What's a good function header?
 Here's a good function header?
assistant
#Here's a good function header.

def dotprint(expr, styles=default_styles, atom=(lambda x: (not isinstance(x, Basic))), maxdepth=None, repeat=True, labelfunc=str, **kwargs):