How can I make my node text bold using attributes of the nodes when trying to draw graph structure using pydot and graphviz?

Question

I have created a node using pydot and GraphViz as follows:

import pydot
graph = pydot.Dot(graph_type = 'digraph')

a = pydot.Node("First Node", style = "filled", color = "red")
graph.add_node(a)

I want text of node a to be bold. How can I do it? Is there any attribute of the node like style, color? Thank you.

Edit: If I need to add \n in the middle of the text, can I simply put \n in the middle as shown:

<<font face="boldfontname">First\nNode</font>>

Answer 1

One possibility (from here) is to use HTML:

import pydot

graph = pydot.Dot(graph_type='digraph')
nd = pydot.Node(
    'First Node',
    label='<<font face="boldfontname">First Node</font>>',
    style='filled',
    color='red')
graph.add_node(nd)
graph.write_pdf('foo.pdf')

Defining a fontname appears to be another possibility.