Examples

The following code examples are included in the examples/ directory of the source repository/distribution. Most of them recreate examples from the graphviz.org gallery or the graphviz.org documentation.

hello.py

"""http://www.graphviz.org/content/hello"""

import graphviz

g = graphviz.Digraph('G', filename='hello.gv')

g.edge('Hello', 'World')

g.view()
_images/hello.svg

process.py

"""http://www.graphviz.org/content/process"""

import graphviz

g = graphviz.Graph('G', filename='process.gv', engine='sfdp')

g.edge('run', 'intr')
g.edge('intr', 'runbl')
g.edge('runbl', 'run')
g.edge('run', 'kernel')
g.edge('kernel', 'zombie')
g.edge('kernel', 'sleep')
g.edge('kernel', 'runmem')
g.edge('sleep', 'swap')
g.edge('swap', 'runswap')
g.edge('runswap', 'new')
g.edge('runswap', 'runmem')
g.edge('new', 'runmem')
g.edge('sleep', 'runmem')

g.view()
_images/process.svg

fsm.py

"""http://www.graphviz.org/content/fsm"""

import graphviz

f = graphviz.Digraph('finite_state_machine', filename='fsm.gv')
f.attr(rankdir='LR', size='8,5')

f.attr('node', shape='doublecircle')
f.node('LR_0')
f.node('LR_3')
f.node('LR_4')
f.node('LR_8')

f.attr('node', shape='circle')
f.edge('LR_0', 'LR_2', label='SS(B)')
f.edge('LR_0', 'LR_1', label='SS(S)')
f.edge('LR_1', 'LR_3', label='S($end)')
f.edge('LR_2', 'LR_6', label='SS(b)')
f.edge('LR_2', 'LR_5', label='SS(a)')
f.edge('LR_2', 'LR_4', label='S(A)')
f.edge('LR_5', 'LR_7', label='S(b)')
f.edge('LR_5', 'LR_5', label='S(a)')
f.edge('LR_6', 'LR_6', label='S(b)')
f.edge('LR_6', 'LR_5', label='S(a)')
f.edge('LR_7', 'LR_8', label='S(b)')
f.edge('LR_7', 'LR_5', label='S(a)')
f.edge('LR_8', 'LR_6', label='S(b)')
f.edge('LR_8', 'LR_5', label='S(a)')

f.view()
_images/fsm.svg

cluster.py

"""http://www.graphviz.org/content/cluster"""

from graphviz import Digraph

g = Digraph('G', filename='cluster.gv')

# NOTE: the subgraph name needs to begin with 'cluster' (all lowercase)
#       so that Graphviz recognizes it as a special cluster subgraph

with g.subgraph(name='cluster_0') as c:
    c.attr(style='filled', color='lightgrey')
    c.node_attr.update(style='filled', color='white')
    c.edges([('a0', 'a1'), ('a1', 'a2'), ('a2', 'a3')])
    c.attr(label='process #1')

with g.subgraph(name='cluster_1') as c:
    c.attr(color='blue')
    c.node_attr['style'] = 'filled'
    c.edges([('b0', 'b1'), ('b1', 'b2'), ('b2', 'b3')])
    c.attr(label='process #2')

g.edge('start', 'a0')
g.edge('start', 'b0')
g.edge('a1', 'b3')
g.edge('b2', 'a3')
g.edge('a3', 'a0')
g.edge('a3', 'end')
g.edge('b3', 'end')

g.node('start', shape='Mdiamond')
g.node('end', shape='Msquare')

g.view()
_images/cluster.svg

er.py

"""http://www.graphviz.org/content/ER"""

import graphviz

e = graphviz.Graph('ER', filename='er.gv', engine='neato')

e.attr('node', shape='box')
e.node('course')
e.node('institute')
e.node('student')

e.attr('node', shape='ellipse')
e.node('name0', label='name')
e.node('name1', label='name')
e.node('name2', label='name')
e.node('code')
e.node('grade')
e.node('number')

e.attr('node', shape='diamond', style='filled', color='lightgrey')
e.node('C-I')
e.node('S-C')
e.node('S-I')

e.edge('name0', 'course')
e.edge('code', 'course')
e.edge('course', 'C-I', label='n', len='1.00')
e.edge('C-I', 'institute', label='1', len='1.00')
e.edge('institute', 'name1')
e.edge('institute', 'S-I', label='1', len='1.00')
e.edge('S-I', 'student', label='n', len='1.00')
e.edge('student', 'grade')
e.edge('student', 'name2')
e.edge('student', 'number')
e.edge('student', 'S-C', label='m', len='1.00')
e.edge('S-C', 'course', label='n', len='1.00')

e.attr(label=r'\n\nEntity Relation Diagram\ndrawn by NEATO')
e.attr(fontsize='20')

e.view()
_images/er.svg

unix.py

"""http://www.graphviz.org/content/unix"""

import graphviz

u = graphviz.Digraph('unix', filename='unix.gv',
                     node_attr={'color': 'lightblue2', 'style': 'filled'})
u.attr(size='6,6')

u.edge('5th Edition', '6th Edition')
u.edge('5th Edition', 'PWB 1.0')
u.edge('6th Edition', 'LSX')
u.edge('6th Edition', '1 BSD')
u.edge('6th Edition', 'Mini Unix')
u.edge('6th Edition', 'Wollongong')
u.edge('6th Edition', 'Interdata')
u.edge('Interdata', 'Unix/TS 3.0')
u.edge('Interdata', 'PWB 2.0')
u.edge('Interdata', '7th Edition')
u.edge('7th Edition', '8th Edition')
u.edge('7th Edition', '32V')
u.edge('7th Edition', 'V7M')
u.edge('7th Edition', 'Ultrix-11')
u.edge('7th Edition', 'Xenix')
u.edge('7th Edition', 'UniPlus+')
u.edge('V7M', 'Ultrix-11')
u.edge('8th Edition', '9th Edition')
u.edge('1 BSD', '2 BSD')
u.edge('2 BSD', '2.8 BSD')
u.edge('2.8 BSD', 'Ultrix-11')
u.edge('2.8 BSD', '2.9 BSD')
u.edge('32V', '3 BSD')
u.edge('3 BSD', '4 BSD')
u.edge('4 BSD', '4.1 BSD')
u.edge('4.1 BSD', '4.2 BSD')
u.edge('4.1 BSD', '2.8 BSD')
u.edge('4.1 BSD', '8th Edition')
u.edge('4.2 BSD', '4.3 BSD')
u.edge('4.2 BSD', 'Ultrix-32')
u.edge('PWB 1.0', 'PWB 1.2')
u.edge('PWB 1.0', 'USG 1.0')
u.edge('PWB 1.2', 'PWB 2.0')
u.edge('USG 1.0', 'CB Unix 1')
u.edge('USG 1.0', 'USG 2.0')
u.edge('CB Unix 1', 'CB Unix 2')
u.edge('CB Unix 2', 'CB Unix 3')
u.edge('CB Unix 3', 'Unix/TS++')
u.edge('CB Unix 3', 'PDP-11 Sys V')
u.edge('USG 2.0', 'USG 3.0')
u.edge('USG 3.0', 'Unix/TS 3.0')
u.edge('PWB 2.0', 'Unix/TS 3.0')
u.edge('Unix/TS 1.0', 'Unix/TS 3.0')
u.edge('Unix/TS 3.0', 'TS 4.0')
u.edge('Unix/TS++', 'TS 4.0')
u.edge('CB Unix 3', 'TS 4.0')
u.edge('TS 4.0', 'System V.0')
u.edge('System V.0', 'System V.2')
u.edge('System V.2', 'System V.3')

u.view()
_images/unix.svg

structs.py

"""http://www.graphviz.org/doc/info/shapes.html#html"""

import graphviz

s = graphviz.Digraph('structs', node_attr={'shape': 'plaintext'})

s.node('struct1', '''<
<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">
  <TR>
    <TD>left</TD>
    <TD PORT="f1">middle</TD>
    <TD PORT="f2">right</TD>
  </TR>
</TABLE>>''')
s.node('struct2', '''<
<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">
  <TR>
    <TD PORT="f0">one</TD>
    <TD>two</TD>
  </TR>
</TABLE>>''')
s.node('struct3', '''<
<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0" CELLPADDING="4">
  <TR>
    <TD ROWSPAN="3">hello<BR/>world</TD>
    <TD COLSPAN="3">b</TD>
    <TD ROWSPAN="3">g</TD>
    <TD ROWSPAN="3">h</TD>
  </TR>
  <TR>
    <TD>c</TD>
    <TD PORT="here">d</TD>
    <TD>e</TD>
  </TR>
  <TR>
    <TD COLSPAN="3">f</TD>
  </TR>
</TABLE>>''')

s.edges([('struct1:f1', 'struct2:f0'), ('struct1:f2', 'struct3:here')])

s.view()
_images/structs.svg

structs_revisited.py

"""http://www.graphviz.org/pdf/dotguide.pdf, Figure 12"""

import graphviz

s = graphviz.Digraph('structs', filename='structs_revisited.gv',
                     node_attr={'shape': 'record'})

s.node('struct1', '<f0> left|<f1> middle|<f2> right')
s.node('struct2', '<f0> one|<f1> two')
s.node('struct3', r'hello\nworld |{ b |{c|<here> d|e}| f}| g | h')

s.edges([('struct1:f1', 'struct2:f0'), ('struct1:f2', 'struct3:here')])

s.view()
_images/structs_revisited.svg

btree.py

"""http://www.graphviz.org/pdf/dotguide.pdf, Figure 13"""

import graphviz
from graphviz import nohtml

g = graphviz.Digraph('g', filename='btree.gv',
                     node_attr={'shape': 'record', 'height': '.1'})

g.node('node0', nohtml('<f0> |<f1> G|<f2>'))
g.node('node1', nohtml('<f0> |<f1> E|<f2>'))
g.node('node2', nohtml('<f0> |<f1> B|<f2>'))
g.node('node3', nohtml('<f0> |<f1> F|<f2>'))
g.node('node4', nohtml('<f0> |<f1> R|<f2>'))
g.node('node5', nohtml('<f0> |<f1> H|<f2>'))
g.node('node6', nohtml('<f0> |<f1> Y|<f2>'))
g.node('node7', nohtml('<f0> |<f1> A|<f2>'))
g.node('node8', nohtml('<f0> |<f1> C|<f2>'))

g.edge('node0:f2', 'node4:f1')
g.edge('node0:f0', 'node1:f1')
g.edge('node1:f0', 'node2:f1')
g.edge('node1:f2', 'node3:f1')
g.edge('node2:f2', 'node8:f1')
g.edge('node2:f0', 'node7:f1')
g.edge('node4:f2', 'node6:f1')
g.edge('node4:f0', 'node5:f1')

g.view()
_images/btree.svg

traffic_lights.py

"""http://www.graphviz.org/content/traffic_lights"""

import graphviz

t = graphviz.Digraph('TrafficLights', filename='traffic_lights.gv',
                     engine='neato')

t.attr('node', shape='box')
for i in (2, 1):
    t.node(f'gy{i:d}')
    t.node(f'yr{i:d}')
    t.node(f'rg{i:d}')

t.attr('node', shape='circle', fixedsize='true', width='0.9')
for i in (2, 1):
    t.node(f'green{i:d}')
    t.node(f'yellow{i:d}')
    t.node(f'red{i:d}')
    t.node(f'safe{i:d}')

for i, j in [(2, 1), (1, 2)]:
    t.edge(f'gy{i:d}', f'yellow{i:d}')
    t.edge(f'rg{i:d}', f'green{i:d}')
    t.edge(f'yr{i:d}', f'safe{j:d}')
    t.edge(f'yr{i:d}', f'red{i:d}')
    t.edge(f'safe{i:d}', f'rg{i:d}')
    t.edge(f'green{i:d}', f'gy{i:d}')
    t.edge(f'yellow{i:d}', f'yr{i:d}')
    t.edge(f'red{i:d}', f'rg{i:d}')

t.attr(overlap='false')
t.attr(label=r'PetriNet Model TrafficLights\n'
             r'Extracted from ConceptBase and layed out by Graphviz')
t.attr(fontsize='12')

t.view()
_images/traffic_lights.svg

fdpclust.py

"""http://www.graphviz.org/content/fdpclust"""

import graphviz

g = graphviz.Graph('G', filename='fdpclust.gv', engine='fdp')

g.node('e')

with g.subgraph(name='clusterA') as a:
    a.edge('a', 'b')
    with a.subgraph(name='clusterC') as c:
        c.edge('C', 'D')

with g.subgraph(name='clusterB') as b:
    b.edge('d', 'f')

g.edge('d', 'D')
g.edge('e', 'clusterB')
g.edge('clusterC', 'clusterB')

g.view()
_images/fdpclust.svg

cluster_edge.py

"""http://www.graphviz.org/pdf/dotguide.pdf, Figure 20"""

import graphviz

g = graphviz.Digraph('G', filename='cluster_edge.gv')
g.attr(compound='true')

with g.subgraph(name='cluster0') as c:
    c.edges(['ab', 'ac', 'bd', 'cd'])

with g.subgraph(name='cluster1') as c:
    c.edges(['eg', 'ef'])

g.edge('b', 'f', lhead='cluster1')
g.edge('d', 'e')
g.edge('c', 'g', ltail='cluster0', lhead='cluster1')
g.edge('c', 'e', ltail='cluster0')
g.edge('d', 'h')

g.view()
_images/cluster_edge.svg

g_c_n.py

"""http://www.graphviz.org/Gallery/gradient/g_c_n.html"""

import graphviz

g = graphviz.Graph('G', filename='g_c_n.gv')
g.attr(bgcolor='purple:pink', label='agraph', fontcolor='white')

with g.subgraph(name='cluster1') as c:
    c.attr(fillcolor='blue:cyan', label='acluster', fontcolor='white',
           style='filled', gradientangle='270')
    c.attr('node', shape='box', fillcolor='red:yellow',
           style='filled', gradientangle='90')
    c.node('anode')

g.view()
_images/g_c_n.svg

angles.py

"""http://www.graphviz.org/Gallery/gradient/angles.html"""

import graphviz

g = graphviz.Digraph('G', filename='angles.gv')
g.attr(bgcolor='blue')

with g.subgraph(name='cluster_1') as c:
    c.attr(fontcolor='white')
    c.attr('node', shape='circle', style='filled', fillcolor='white:black',
           gradientangle='360', label='n9:360', fontcolor='black')
    c.node('n9')
    for i, a in zip(range(8, 0, -1), range(360 - 45, -1, -45)):
        c.attr('node', gradientangle=f'{a:d}', label=f'n{i:d}:{a:d}')
        c.node(f'n{i:d}')
    c.attr(label='Linear Angle Variations (white to black gradient)')

with g.subgraph(name='cluster_2') as c:
    c.attr(fontcolor='white')
    c.attr('node', shape='circle', style='radial', fillcolor='white:black',
           gradientangle='360', label='n18:360', fontcolor='black')
    c.node('n18')
    for i, a in zip(range(17, 9, -1), range(360 - 45, -1, -45)):
        c.attr('node', gradientangle=f'{a:d}', label=f'n{i:d}:{a:d}')
        c.node(f'n{i:d}')
    c.attr(label='Radial Angle Variations (white to black gradient)')

g.edge('n5', 'n14')

g.view()
_images/angles.svg

rank_same.py

"""https://stackoverflow.com/questions/25734244/how-do-i-place-nodes-on-the-same-level-in-dot"""

import graphviz

d = graphviz.Digraph(filename='rank_same.gv')

with d.subgraph() as s:
    s.attr(rank='same')
    s.node('A')
    s.node('X')

d.node('C')

with d.subgraph() as s:
    s.attr(rank='same')
    s.node('B')
    s.node('D')
    s.node('Y')

d.edges(['AB', 'AC', 'CD', 'XY'])

d.view()
_images/rank_same.svg