How do I bring Python variables into Graphviz when using the Jupyter kernel?

[athyfr]

Description

I'm using Python and Graphviz code-blocks, and I'd like to reference a Python variable from within the Graphviz block. Something like so:

```{python}
num1 = 10
num2 = 5
print("variables reference different object!")
num1_1_to_graphviz = num1
num2_1_to_graphviz = num2
num2 = num1
print("variables reference the same object thanks to the default caching mechanisms!")
num2_2_to_graphviz = num2
```

```{dot}
digraph G {
  num1 --- "`{python}num1_1_to_graphviz`"
  num2 --- "`{python}num2_1_to_graphviz`"
  num2 --> "`{python}num2_2_to_graphviz`"
}
```

Would something like this be possible? I couldn't find any information about this case from my own research, besides a mention that variables cannot be passed between arbitrary languages. However, I figure this is different, since the first is Python, and I'm using the Jupyter kernel.

I'm using Quarto 1.8.26. I can update if needed.

Thanks!

[mcanouil]

You need to make your Python code emit the whole dot code cell with things like display(markdown(...)) and #| output: asis.

[athyfr]

Alright, thanks!

[cderv]

I would also look at existing modules like

• https://github.com/pygraphviz/pygraphviz
• https://github.com/xflr6/graphviz

If they already have some supports for jupyter cell output, this could be easier. Or anyway, they could help write the full syntax and probably help support python variable.

Maybe there are others.