dependencies on pydot and graphviz not correctly handled

[TobiBu]

Hi,

I just discover that when trying to use the TreePlot routine I get an error that graphviz and pyrotechnics are not installed.
These dependencies should be handled by pip install, right?

[brittonsmith]

Unfortunately, the python graphviz module installed with pip is not the same as the core graphviz library. Currently, ytree uses the pydot module, which requires the core graphviz library. As far as I know, this library cannot be installed with pip or conda and requires something like homebrew for macs and apt-get for linux. This is why it's not listed as an explicit package dependency. It looks like the python graphviz module (https://pypi.org/project/graphviz/) could be a viable alternative to pydot. It's not something I have time to look at right now, but if you are interested in having a look, I'm happy to talk with you more about this.