Cant create png file to draw Decision Tree with Graphviz (Python)

Question

When running a .py file, while trying to create a PNG file previously created I receive this error

pydotplus.graphviz.InvocationException: Program terminated with status: 1. stderr follows: Format: "png" not recognized. Use one of:

I don't receive anymore information. I have already installed pydot, pydotplus, graphviz but the problem keeps happening.

The code that triggers the error is:

graph = pydotplus.graph_from_dot_data(dot_data.getvalue())  
graph.write_png(filename)

By watching the filesystem, I can see that the file is created but has 0Kb and can't be open. So, the write wasn't probably successful.

Any suggestion?

Edit: Solved.

Had to reinstall Graphviz, set the Environment variable (manually) in Windows, restart computer and the image was created.

Answer 1

Can you try this in your Anaconda prompt :

conda install pydotplus

I was facing the same issue and running this command fixed it for me. I was using a pip installation earlier, and that somehow seems to conflict with Jupyter.