code: def addNodeToGraph(nodeName, graphFileHandle, label, width=0.3, height=0.3, shape="circle", colour="black", fontsize=14):
      
      graphFileHandle.write("node[width=%s,height=%s,shape=%s,colour=%s,fontsize=%s];\n" % (width, height, shape, colour, fontsize))
      graphFileHandle.write("%s [label=\"%s\"];\n" % (nodeName, label))
docs: Adds a node to the graph.