Yes,
Have a look at these screenshots from the editor.
You can click at the position of the red dot to insert a breakpoint.
This will halt the script at that point and you can inspect the content of the current variables:
More to find on rhinocommon:
https://developer.rhino3d.com/api/RhinoCommon/html/N_Rhino.htm#!
search for plane for example:
A good way to explore working with rhino common in python is to insert breakpoints before a rhinoscript method and the step into the code:
if you click Step Into or F11
you will see what code is executed for rs.ViewCplane():
-Willem