File: plot_subgraph.py

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python-pygraphviz 1.14-2
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"""
Subgraph
========

Specify a subgraph in pygraphviz.
"""

import pygraphviz as pgv

A = pgv.AGraph()
# add some edges
A.add_edge(1, 2)
A.add_edge(2, 3)
A.add_edge(1, 3)
A.add_edge(3, 4)
A.add_edge(3, 5)
A.add_edge(3, 6)
A.add_edge(4, 6)
# make a subgraph with rank='same'
B = A.add_subgraph([4, 5, 6], name="s1", rank="same")
B.graph_attr["rank"] = "same"
print(A.string())  # print dot file to standard output
A.draw("subgraph.png", prog="neato")