Decision Trees with Graphviz and Python

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I started to learn programing with Python, and just created a simple decision tree with Python and Graphviz. I would like to use this, to visualize chess decision trees. I would like to have pictures of a specific chess positions at the nodes, and I`m wondering, if and how I could automate f.ex the process of generating bmp-files from pgn, and import them to a tree.