graphviz.py

import graphviz


# transparent color #rrggbbaa
blue = {'color': '#0000ff30', 'style': 'filled'}
green = {'color': 'green'}

# render to specific format
dot = graphviz.Digraph('G', filename='test.gv', format='png')

dot.node('A', 'King Arthur', blue)
dot.node('B', 'Sir Bedevere\nthe Wise', green)

# color arrow and label-color
dot.edge('A', 'B', label="read", color="yellow", fontcolor="purple")
dot.edge('A', 'B', label="write")

# dot.view()
dot.render()