Generate a graphviz dot file for a digraph represented as an adjacency list

render_digraph.py

G = [("A", "B"), ("B", "C"), ("C", "D")]

def render_digraph(G):
    def g():
        for p, c in G:
            yield  '"{}" -> "{}"'.format(p, c)

    lines = "\n".join(g())
    return """
    digraph {{
    {}
    }}
    """.format(lines)

with file("graph.dot", "w") as fo:
  fo.write(render_digraph(G))

python render_digraph.py
dot -Tpng graph.dot > graph.png