from jhplot import *
import os
cwd = os.getcwd()

s = """
@startdot
digraph foo {
  node [style=rounded]
  node1 [shape=box]
  node2 [fillcolor=yellow, style="rounded,filled", shape=diamond]
  node3 [shape=record, label="{ a | b | c }"]

  node1 -> node2 -> node3
   }
  @enddot
"""

h=HDiagram(s)
# use the extensions EPS, PDF, SVG to change file format
h.export(cwd+"/hdiagram.png")
IView(cwd+"/hdiagram.png")