<｜begin▁of▁sentence｜>### Instruction:
Given the 'pygraphviz_layout' function, which creates node positions for a NetworkX graph using Graphviz layout programs, can you provide an example Python code to show how to use it for the Petersen graph with the 'dot' layout program, including an optional usage with the 'twopi' layout specifying a root node, followed by drawing and displaying the graph with matplotlib?
### Response:
import networkx as nx
from networkx.drawing.nx_agraph import graphviz_layout

G = nx.petersen_graph()
pos = graphviz_layout(G, prog='dot')
root_pos = graphviz_layout(G, prog='twopi', root='0')
nx.draw(G, pos, with_labels=True)
import matplotlib.pyplot as plt
plt.show()
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