There is a particular behaviour in RStudio that I would really love to be able to do in python, but haven't found the combination of IDE/or notebook that will do it yet:

I want to execute through lines with cmd-return, or by highlighting and pressing cmd-return, and then see the change in the variables in a separate pane, like RStudio's environment pane. Bonus points if I can click on table variables in the environment pane and examine them in a separate tab with sorting and searching. Spyder comes closest but the execution part doesn't work as fluidly.