[PyQt] selectionChanged or currentChanged in QTreeView

[danny]

> Anyhow, I would use the currentChanged signal if you're interested in a single 
> currently highlighted item, or activated if you connect to more expensive / 
> interruptive operations that should be more explicitly activated.

Thanks to everyone for the explanations. I'm starting to grok what is going on.

One followup question to your response. I can't find a "currentChanged"
signal, only a "currentChanged" slot. Clearly there is something I am not
understanding. I overrode QAbstractItemView.currentChanged because that is
all I could find. In my code, I emitted my own signal. Is there in fact a 
"currentChanged" signal, and if so, how do I connect to it? 

thanks,
Danny