Converting dot to png in python

pydot needs the GraphViz binaries to be installed anyway, so if you've already generated your dot file you might as well just invoke dot directly yourself. For example:

from subprocess import check_call
check_call(['dot','-Tpng','InputFile.dot','-o','OutputFile.png'])

You can use pygraphviz. Once you have a graph loaded, you can do

graph.draw('file.png')

Load the file with pydot.graph_from_dot_file to get a pydot.Dot class instance. Then write it to a PNG file with the write_png method.

import pydot

(graph,) = pydot.graph_from_dot_file('somefile.dot')
graph.write_png('somefile.png')