digraph g{
  z [label="raw text including probable hostnames"];
  a -> b;
  a [label=".domain()",shape=box,fillcolor="palegreen",style="filled"];
  z -> a [label=" extracting"];
  b [label=".validdomain(extended=True)",shape=box,fillcolor="palegreen",style="filled"];
  c [label=".localizedomain(cc='country code')",shape=box,fillcolor="palegreen",style="filled"];
 b->c;
  e [label=".validdomain(extended=False)",shape=box,fillcolor="palegreen",style="filled"];
a->e;
f [label=".rankdomain()",shape=box,fillcolor="palegreen",style="filled"];
c->f;
g [label=".include(expression=regexp)",shape=box,fillcolor="palegreen",style="filled" ];
h [label=".exclude(expression=regexp)",shape=box,fillcolor="palegreen",style="filled" ];
f->g;
g->h;
e->g;
i [label="set of hostnames", fillcolor="palegreen",style="filled"];
h->i;
}