Matplotlib is not listed as dependency

[Benjamin2107]

When trying to plot something without a filename, prov tries to plot it using matplotlib. However, matplotlib is not listed as a dependency.

Since pydot is listed as a normal dependency, i would also put it there:

dependencies = [
    "networkx>=2.0",
    # Supporting graphic outputs (e.g. PNG, SVG, PDF) - a local graphviz is required
    "pydot>=1.2.0",
    "matplotlib>=3.9.0",
    "python-dateutil>=2.2",  # TODO: is this really needed?
]

However. I really liked the way it was handled in version 2.0.1 of prov with an optional dot section. As long as you don't need any plot, you also don't need to install it. This would look like this:

[project.optional-dependencies]
rdf = [
    "rdflib>=4.2.1,<7",
]
xml = [
    "lxml>=3.3.5",
]
dot = [
    # Supporting graphic outputs (e.g. PNG, SVG, PDF) - a local graphviz is required
    "pydot>=1.2.0",
    "matplotlib>=3.9.0",
]

[trungdong]

@Benjamin2107 You're right that matplotlib is required to show an image of the "plotted" PROV graph at the moment.

However, I'm reluctant to add a heavy dependency just to display an image, with no requirement elsewhere. As you can see in the code, it was chosen because the library plays nice with an IPython notebook, whose users are likely to have matplotlib installed already.

I'm inclined to leave the code as-is until I find a better solution to display a PROV graph's image.